Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1989-01-10
1990-03-20
Swann, III, Glen R.
Communications: electrical
Condition responsive indicating system
Specific condition
116 22A, 119 29, 340527, 340556, G08B 1318, G08B 2100, A01K 300
Patent
active
049105000
ABSTRACT:
Livestock entering a border zone along a vehicle roadway are deterred by devices triggered into operation simultaneously with a remote alarm by interruption of photo-electric beams at ends of the zone from which the animals enter or exit. The deterring apparatus is reset to prevent operation in response to travel of a vehicle through the zone and is temporarily disabled by selective switch actuation.
REFERENCES:
patent: 3611363 (1971-10-01), McCrea
patent: 4503399 (1985-03-01), Carr
patent: 4788530 (1988-11-01), Bernier
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