There are enough things out on the web about how to pick Medeco that I agree that is shouldn’t be discussed here. History of Medeco locks I would be happy to discuss and even the patent documents as the company only started in 1968 but the original lock was thought up back in the mid 1950s so they say.
Patent 3,499,302 March 10 1970
http://www.google.com/patents?id=dyYMAAAAEBAJ&printsec=drawing&zoom=4#v=onepage&q&f=false
———- Post added at 02:23 PM ———- Previous post was at 02:18 PM ———-
After looking thru the Patent I have to say it is VERY different than what was produced later. Kinda reminds me of the Byron Phelps patent of the Unit lock in 1899. The lock he patent and the one that was made since were different enough to be a different lock even thou the patent still was in effect.