US PATENT SUBCLASS 116 / 20
.~ Heliographic

Current as of: June, 1999
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116 /   HD   SIGNALS AND INDICATORS

18  DF  CODE SIGNALING {2}
20.~ Heliographic

DEFINITION

Classification: 116/20

(under subclass 18) Devices in which the signals are given by mechanically controlled intermittent flashes of light, usually reflected sunlight.