US PATENT SUBCLASS 400 / 180
.~.~ Including key-board driven by external pneumatic source

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

176  DF  HAVING FLUID-PRESSURE POWER DRIVE {4}
179  DF  .~ For type-face selection or choice {2}
180.~.~ Including key-board driven by external pneumatic source

DEFINITION

Classification: 400/180

Including key-board driven by external pneumatic source:

(under subclass 179) Subject matter wherein the energy of said fluid is used to depress the selected key* elements on the key-board* of the typewriter, and wherein the force exerted upon the fluid is applied by means outside of the typewriter.