Title:
Helmet with detecting circuit mounted thereon for indicating approach to an energized powerline
United States Patent 3309690
Inventors:
Moffitt, Melville M.
Publication Date:
03/14/1967
Export Citation:
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Assignee:
Moffitt, Melville M.
Primary Class:
340/657
Other Classes:
324/67, 324/72, 324/133, 340/565, 340/654, 455/269, 455/351
International Classes:
G08B3/10; G08B3/00
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US Patent References:
3009099Testing instrument for electric alternating voltages
2904645Helmet radios including a transistor amplifier
2789282Automatic approach alarm
2651021Fault detector
2615969Electrical power line warning device for vehicles with extended booms
2554270Compact radio receiver
2338245Fault-locating device
2109189Electrical testing and detecting apparatus