US PATENT SUBCLASS 400 / 120.12
.~.~.~ By voltage regulation

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

118.2  DF  TYPING BY OTHER THAN TYPE-FACE OR TYPE-DIE {3}
120.01  DF  .~ Thermal {7}
120.09  DF  .~.~ Density control {6}
120.12.~.~.~ By voltage regulation

DEFINITION

Classification: 400/120.12

By voltage regulation:

(under subclass 120.09) Subject matter wherein the regulating means responds to changes in electrical potential across a heating element used for heating the recording means.