US PATENT SUBCLASS 400 / 176
HAVING FLUID-PRESSURE POWER DRIVE

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

176HAVING FLUID-PRESSURE POWER DRIVE {4}
177  DF  .~> Including pneumatic decoder for perforated tape
178  DF  .~> For producing typewriter-control tape (e.g., perforated tape, etc.)
179  DF  .~> For type-face selection or choice {2}
182  DF  .~> For movement of carriage or platen {1}

DEFINITION

Classification: 400/176

HAVING FLUID-PRESSURE POWER DRIVE:

(under the class definition) Subject matter wherein a typewriter or a portion thereof is caused to operate by energy that is derived from or transmitted via the exertion of force upon a fluid (i.e., a flowable material).

(1) Note. The most usual fluid employed in these typewriters is air, but a liquid may also be employed as a fluid-pressure means.