US PATENT SUBCLASS 246 / 109
.~ Flow retarded

Current as of: June, 1999
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246 /   HD   RAILWAY SWITCHES AND SIGNALS

108  DF  TIME INDICATION, AUTOMATIC {2}
109.~ Flow retarded

DEFINITION

Classification: 246/109

(under subclass 108) Systems and devices in which the retarded flow of gases, liquids, or finely-divided particles of solids is utilized for giving the time indication.