US PATENT SUBCLASS 400 / 480
.~ Including control of key action (e.g., buffer, etc.)

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

472  DF  KEY-BOARD OR KEY LEVER-ACTUATING MECHANISM {12}
480.~ Including control of key action (e.g., buffer, etc.) {1}
481  DF  .~.~> By regulating key force or movement (e.g., key dip or stroke)

DEFINITION

Classification: 400/480

Including control of key action (e.g., buffer, etc.):

(under subclass 472) Subject matter wherein significance is attributed to the regulating or governing of the movement or speed of movement or stopping of a key* element or said fulcrumed bar (i.e., a key lever) of a typewriter key-board*.

(1) Note. This subclass provides for a buffer that absorbs some of the kinetic energy imparted to the keys of the typewriter by the typist.