1985 - Volume #9, Issue #6, Page #27
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Calf Detector Signals Delivery Time
You'll never miss another calving with this new "calf detector" radio transmitter that mounts on a cow's rear end and is triggered when the cow raises her tail at the onset of labor.

"When the cow raises her tail for 3 min., the transmitter emits a 10-sec. signal, then shuts itself off. If the tail is stil..........


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1985 - Volume #9, Issue #6