Okay so I after all the open source info lead nowhere, I made a throwaway account on a 2000s era hobbyist PHP forum and THAT’S where I found the research paper that unlocked everything after translating from Russian and pre-standardization local units
Also me trying to replace a three-way light switch
Man idk, this seems like a really hard to figure out this wiring diagram
Me researching a topic that piques my curiosity;
Also me trying to replace a three-way light switch