G - Physics – 11 – B
Patent
G - Physics
11
B
352/31.1
G11B 23/087 (2006.01)
Patent
CA 1220859
40033 CAN 8A Abstract of the Disclosure One broad wall of a recording cassette has a recognition hole which is covered by a breakout tab (here called a "removable piece"), and there is a chamber projecting from the other broad wall of the cassette such that a punch which dislodges the removable piece permanently wedges it into the chamber.
473240
Gebeke Charles D.
Weavers Mark W.
Yamasaki Ken'ichi
Minnesota Mining And Manufacturing Company
Smart & Biggar
LandOfFree
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