I have finished a page on my website that illustrates Yale's innovation of being the first mass producer of time locks to introduce a modular time lock movement design and to use "off the shelf" pocket watch movements. Sargent & Greenleaf followed on with what I consider a better design about a year later and modularity became standard through the industry since then. The Type A was a patent prototype, with the Types B though G in actual production. However this line of locks was a commercial failure and few were produced. To the best of my knowledge this is the only complete set. The page is at: www.my-time-machines.net/yale_type_a-e_overview.htm . Any comments are welcome.

BTW I wanted to create a tag for this post by was denied what should I do to add a tag?