Dear Raf:
I reread. There is no advantage over other system, but is an experimental method, a key (lock) miguelete primitive. Also in primitive wheel keys (wheellock)) the lid cubrecazoleta (COVERPAN) was slippery but not with an articulated cam, but with a fixed cam, and described a circular arc (as in the key (lock) twice MET , which is in this thread.
Afectuosamenmte. Fernando K
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