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Communications
Class Information
Number:
340/531
Name:
Communications: electrical
>
Condition responsive indicating system
> With particular coupling link
Description:
Subject matter having specific connecting means between the sensing and indicating means.
Sub-classes under this class:
Class Number
Class Name
Patents
340/532
Having particular safety function
58
340/539.1
Radio
2,022
340/533
Wired
187
Patents under this class:
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Patent Number
Title Of Patent
Date Issued
3985318
Helicopter blade crack indicator
Oct. 12, 1976
3984638
Processor for use between keyboard telephone set and television set
Oct. 5, 1976
3973250
Acoustically coupled burglar alarm system
Aug. 3, 1976
3964044
Multiple operating alarm systems employing oil burner flame monitoring relays
Jun. 15, 1976
3937889
Data communication apparatus for use in a telephone system
Feb. 10, 1976
3938124
Alarm system sensing device
Feb. 10, 1976
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