1978 - Volume #2, Issue #6, Page #28
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New Control Switch Is A Humdinger
Unable to keep a conventional pressure switch from sticking, an Indiana hog farmer solved the problem by inventing a new "Humdinger" switch for automatically turning grain and feed augers on and off.
Activated by a built-in light bulb and electric eye sensor, it operates automatically whether in broad daylight or..........


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1978 - Volume #2, Issue #6