I honestly don't know if there is a name other than "custom pinhole latches". These were all custom made as required. I am not aware of a business that creates anything like this. You can find documentaries on hidden speak-easy's online but I don't have any links handy. The most prevalent implementations of this setup were in New York City but other big cities had them. I want to say the concept dates back to mid-evil times.

"Pinhole latch" sounds about right, I'll see what I can do with that.