US PATENT SUBCLASS 178 / 71.11
.~.~ Piezoelectric
Current as of:
June, 1999
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178 /
HD
TELEGRAPHY
70 R
DF
REPEATERS
{16}
71.1
DF
.~ Automatic in either direction {14}
71.11
.~.~ Piezoelectric
DEFINITION
Classification: 178/71.11
Piezoelectric:
(under subclass 71.1) Telegraph repeater using effect of a material which generated an electrical output when subjected to a mechanical stress.