The court file number is used to identify a document and goes back to the file regulations (AktO) of November 28, 1934 and its predecessors.

The German "file number" (aktenzeichen) is a unique identification of a file, commonly used in their court system and predecessors as well as file numbers in public administration since at least 1934.

Niklas Luhmann studied law at the University of Freiburg from 1946 to 1949, when he obtained a law degree, before beginning a career in Lüneburg's public administration where he stayed in civil service until 1962. Given this fact, it's very likely that Luhmann had in-depth experience with these sorts of file numbers as location identifiers for files and documents.

We know these numbering methods in public administration date back to as early as Vienna, Austria in the 1770s.

The missing piece now is who/where did Luhmann learn his note taking and excerpting practice from? Alberto Cevolini argues that Niklas Luhmann was unaware of the prior tradition of excerpting, though note taking on index cards or slips had been commonplace in academic circles for quite some time and would have been reasonably commonplace during his student years.

Are there handbooks, guides, or manuals in the early 1900's that detail these sorts of note taking practices?

Perhaps something along the lines of Antonin Sertillanges’ book The Intellectual Life (1921) or Paul Chavigny's Organisation du travail intellectuel: recettes pratiques à l’usage des étudiants de toutes les facultés et de tous les travailleurs (in French) (Delagrave, 1918)?

Further recall that Bruno Winck has linked some of the note taking using index cards to legal studies to Roland Claude's 1961 text:

I checked Chavigny’s book on the BNF site. He insists on the use of index cards (‘fiches’), how to index them, one idea per card but not how to connect between the cards and allow navigation between them.

Mind that it’s written in 1919, in Strasbourg (my hometown) just one year after it returned to France. So between students who used this book and Luhmann in Freiburg it’s not far away. My mother taught me how to use cards for my studies back in 1977, I still have the book where she learn the method, as Law student in Strasbourg “Comment se documenter”, by Roland Claude, 1961. Page 25 describes a way to build secondary index to receive all cards relatives to a topic by their number. Still Luhmann system seems easier to maintain but very near.

<small><cite class='h-cite via'>ᔥ <span class='p-author h-card'> Scott P. Scheper </span> in Scott P. Scheper on Twitter: "The origins of the Zettelkasten's numeric-alpha card addresses seem to derive from Niklas Luhmann's early work as a legal clerk. The filing scheme used is called "Aktenzeichen" - See https://t.co/4mQklgSG5u. cc @ChrisAldrich" / Twitter (<time class='dt-published'>06/28/2022 11:29:18</time>)</cite></small>

Link to: - https://hypothes.is/a/Jlnn3IfSEey_-3uboxHsOA - https://hypothes.is/a/4jtT0FqsEeyXFzP-AuDIAA

Despite his career as an administrative scientist, Luhmann eschewed the International Library Format which allows for DIN A6 and DIN A7 for "literature cards."

Cross reference:

1. See Deutsches Institut für Normung e.V. (DIN), Publikation und Dokumentation 2. Erschließung von Dokumenten, Informationsverarbeitung, Reprographie, Bibliotheksverwaltung, Normen, vol. 154 of DIN-Taschenbuch , 2nd ed. (Berlin, Kö ln: Beuth, 1984), 64f.

link to https://hypothes.is/a/hKgd_t1jEeyxoxOujPZNkg

Joshua Weitz. (2021, April 7). The same approaches that work against SARS-CoV-2 work against variants like B.1.1.7: Mask Avoid indoor gatherings Socialize outdoors And, reinforces the need to continue to scale-up vaccine administration to all 16+. [Tweet]. @joshuasweitz. https://twitter.com/joshuasweitz/status/1379820197696180233

Prof. Akiko Iwasaki. (2022, January 27). Vaccines that reduce infection & disease are needed to combat the pandemic. Here, @tianyangmao @BenIsraelow et al. Describe our new mucosal booster strategy, Prime and Spike, to induce such immunity via nasal delivery of unadjuvanted spike vaccine 🧵 (1/) https://biorxiv.org/content/10.1101/2022.01.24.477597v1 https://t.co/bcB5MFph9F [Tweet]. @VirusesImmunity. https://twitter.com/VirusesImmunity/status/1486510697332842498

Why can't it act and prosecute with the new administration?

https://apnews.com/article/presidential-elections-election-2020-elections-778951007a888c1f2af6babbb198634b

Flu and Covid jabs safe to be given at same time, study finds | Vaccines and immunisation | The Guardian. (n.d.). Retrieved October 1, 2021, from https://www.theguardian.com/society/2021/sep/30/flu-covid-jabs-safe-same-time-study?CMP=Share_iOSApp_Other

Commissioner, O. of the. (2021, August 16). Coronavirus (COVID-19) Update: FDA Authorizes Additional Vaccine Dose for Certain Immunocompromised Individuals. FDA. https://www.fda.gov/news-events/press-announcements/coronavirus-covid-19-update-fda-authorizes-additional-vaccine-dose-certain-immunocompromised

I've noticed this phenomenon as well. When criticizing public policy, writers should be required to write down their alternate plans and then go at least one or two levels deep as to the knock on effects that their decisions are likely to have.

It's easy to criticize, but it's much harder to do the actual work and thinking to actually do something else.

Rella, S. A., Kulikova, Y. A., Dermitzakis, E. T., & Kondrashov, F. A. (2021). Rates of SARS-CoV-2 transmission and vaccination impact the fate of vaccine-resistant strains. Scientific Reports, 11(1), 15729. https://doi.org/10.1038/s41598-021-95025-3

Taquet, M., Husain, M., Geddes, J. R., Luciano, S., & Harrison, P. J. (2021). Cerebral venous thrombosis and portal vein thrombosis: A retrospective cohort study of 537,913 COVID-19 cases. MedRxiv, 2021.04.27.21256153. https://doi.org/10.1101/2021.04.27.21256153

Data show panic, disorganization dominate the study of Covid-19 drugs. (2020, July 6). STAT. https://www.statnews.com/2020/07/06/data-show-panic-and-disorganization-dominate-the-study-of-covid-19-drugs/

The UK’s app failure sums up our fatally flawed coronavirus response | John Naughton. (2020, July 25). The Guardian. http://www.theguardian.com/commentisfree/2020/jul/25/the-uk-app-failure-sums-up-our-fatally-flawed-coronavirus-response

Commissioner, O. of the. (2020, December 14). FDA Takes Key Action in Fight Against COVID-19 By Issuing Emergency Use Authorization for First COVID-19 Vaccine. FDA; FDA. https://www.fda.gov/news-events/press-announcements/fda-takes-key-action-fight-against-covid-19-issuing-emergency-use-authorization-first-covid-19

Huang, P. (2021, April 1). How The CDC Is Battling The Pandemic And Working To Regain Public Trust: Shots—Health News: NPR. https://www.npr.org/sections/health-shots/2021/04/01/982761755/inside-the-cdcs-battle-to-defeat-the-virus?utm_campaign=storyshare&utm_source=twitter.com&utm_medium=social

NIHR issues guidance to ensure research protected in a ‘second wave.’ (n.d.). Retrieved October 13, 2020, from https://www.nihr.ac.uk/news/nihr-issues-guidance-to-ensure-research-protected-in-a-second-wave/25858

Boseley, S. (2021, March 15). Coronavirus: report scathing on UK government’s handling of data. The Guardian. https://www.theguardian.com/world/2021/mar/15/mp-report-scathing-on-uk-goverment-handling-and-sharing-of-covid-data

Zhang, S. (2020, November 10). The Lame-Duck Vaccine. The Atlantic. https://www.theatlantic.com/health/archive/2020/11/bidens-vaccine-reset/617059/

David Rothschild on Twitter. (n.d.). Twitter. Retrieved October 17, 2020, from https://twitter.com/DavMicRot/status/1316429651988877312

Pure corruption here. Protectionism to prop up profits of approximately 630 million versus major benefits and savings of 300 billion. Even if you look at the calculus of the entire industry of 70 billion it becomes a no brainer.

So now the White House is lying about children's television shows? Where does it end?

Unpresidented is a great word for the Trump administration

If this is the case, then where is this "new" playbook? And can they point to specific pieces on that timeline that indicate that they're actually performing better than the prior playbook? Let's see the evidence here.

Who’s to Blame for COVID-19 Outbreaks at Colleges and Universities? (2020, September 15). Bill of Health. http://blog.petrieflom.law.harvard.edu/2020/09/15/whos-to-blame-for-covid-19-outbreaks-at-colleges-and-universities/

Trump officials interfered with CDC reports on Covid-19. (n.d.). POLITICO. Retrieved September 14, 2020, from https://www.politico.com/news/2020/09/11/exclusive-trump-officials-interfered-with-cdc-reports-on-covid-19-412809

Spencer, S. H. (2020, September 1). CDC Did Not “Admit Only 6%” of Recorded Deaths from COVID-19. FactCheck.Org. https://www.factcheck.org/2020/09/cdc-did-not-admit-only-6-of-recorded-deaths-from-covid-19/

r/BehSciResearch—Inertia in academic priorities. (n.d.). Reddit. Retrieved June 16, 2020, from https://www.reddit.com/r/BehSciResearch/comments/h9cilq/inertia_in_academic_priorities/

Trump Back-to-School Threats Pressure Educators Fearing Covid. (n.d.). Retrieved September 3, 2020, from https://news.bloomberglaw.com/coronavirus/trump-back-to-school-threats-pressure-educators-fearing-covid-1

Hurst, D., & Murphy, K. (2020, June 22). Trump’s misleading information enables China to sow discord among allies, research finds. The Guardian. https://www.theguardian.com/australia-news/2020/jun/23/trumps-misleading-information-enables-china-to-sow-discord-among-allies-research-finds

The Trump administration must stop sidelining the CDC. (2020). Nature, 583(7818), 660–660. https://doi.org/10.1038/d41586-020-02231-6

FDA allowing saliva-based test funded by NBA. (2020, August 15). ESPN.Com. https://www.espn.com/nba/story/_/id/29667299/fda-allowing-saliva-based-test-funded-nba

News, A. B. C. (n.d.). Trump, DeVos downplay risks of reopening schools, claim children don’t spur transmission: FACT CHECK. ABC News. Retrieved August 9, 2020, from https://abcnews.go.com/Politics/trump-devos-downplay-risks-reopening-schools-claim-children/story?id=71950023

Chernoff, A. W., & Warman, C. (2020). COVID-19 and Implications for Automation (Working Paper No. 27249; Working Paper Series). National Bureau of Economic Research. https://doi.org/10.3386/w27249

That's been my experience so far.