US PATENT SUBCLASS 178 / 16
.~.~ Current reversing

Current as of: June, 1999
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178 /   HD   TELEGRAPHY

2 R  DF  SYSTEMS {21}
3  DF  .~ Automatic {4}
16.~.~ Current reversing

DEFINITION

Classification: 178/16

(under subclass 3) Automatic systems in which direct and reversed currents are employed, usually with pole changers.

SEE OR SEARCH THIS CLASS, SUBCLASS:

8, for multiple pen facsimile systems.

17, for automatic transmitters or recorders.

62, for chemical-type telegraph systems.

63, for cable-type telegraph systems. 67.1, for modified alternating current telegraph systems.

69, for line clearing and circuit maintenance systems.

SEE OR SEARCH CLASS

361, Electricity: Electrical Systems and Devices,

245+, for pole changers of general application.