US PATENT SUBCLASS 116 / 153
.~.~ Door knob contained

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

148  DF  BELLS {10}
152  DF  .~ Gong type {4}
153.~.~ Door knob contained

DEFINITION

Classification: 116/153

(under subclass 152) Devices in which the bell is placed within a hollow doorknob or itself forms the knob.

SEE OR SEARCH THIS CLASS, SUBCLASS:

10, for doorknob gongs which are operated by turning the knob and latch.