1992 - Volume #16, Issue #5, Page #30
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Wireless Driveway Alarms
I am a farmer and about 8 years ago I started manufacturing wireless driveway alarms. Our radio-operated driveway alert consists of two parts - a transmitter and a bell-receiver. The transmitter is operated by a 9-volt battery which normally lasts 6 mos. to a year. The transmitter sends out an invisible beam approximat..........


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1992 - Volume #16, Issue #5