US PATENT SUBCLASS 400 / 664
.~ For interlocking plural functions or mechanisms

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

663  DF  LOCKING OR INTERLOCKING MECHANISM {7}
664.~ For interlocking plural functions or mechanisms {2}
665  DF  .~.~> Plural carriage-moving mechanisms (e.g., escapement, tabulation, etc.)
666  DF  .~.~> Plural keys or key linkages (e.g., for type-face selection, etc.)

DEFINITION

Classification: 400/664

For interlocking plural functions or mechanisms:

(under subclass 663) Subject matter wherein significance is

attributed to means for preventing two mutually exclusive operations from occurring simultaneously or to means for preventing two mutually exclusive movable members from moving simultaneously.

(1) Note. The significant aspect of this and indented subclasses lies in the phrase "mutually exclusive". As discussed in (1) Note of subclass 663 above, mutually exclusive operations or movements exist where it would not be desirable, or would result in jamming or faulty operation, for one to occur simultaneously with the other.