Timing device for live animal traps
作者： Ronald E. Barry , Alfred A. Fressola
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摘要: A timing device for use with live animal traps accurately and easily maintains the elapsed time since an entering caused trap door to close. The uses a switch that senses closure activate module. All components of mount unobtrusively so as not hinder its operation and, collapsible traps, allow folding storage transport.
lens.org 参考文章(5)
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