US PATENT SUBCLASS 400 / 677
.~ For locking selected group(s) of keys

Current as of: June, 1999
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400 /   HD   TYPEWRITING MACHINES

663  DF  LOCKING OR INTERLOCKING MECHANISM {7}
677.~ For locking selected group(s) of keys

DEFINITION

Classification: 400/677

For locking selected group(s) of keys:

(under subclass 663) Subject matter wherein significance is attributed to means for preventing movement of a particular plurality of key* elements.