Re: Plug adaptors of the past
When I joined the Patent Office, the subject matter dealt with in the training group I was assigned to, included plugs and sockets (officially known as "two-part couplings"), as well as cables and fuses. The relevant MK patents had already been granted by then, and copies were in the search files. The patent for the original design of rotatable shutter requiring simultaneous pin insertion, covered 2 pin sockets as well as three-pin. The later patented modification for 3 pin sockets was indeed designed specifically to defeat europlug insertion.
Last edited by emeritus; 14th Apr 2021 at 6:05 pm.
Reason: typos
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