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Subject Item
isa:351160455
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Defined in detail, the present invention is a telephone line monitoring circuit and apparatus, comprising: (a) circuit connector means for connection into a telephone line jack at one end; (b) a bridge circuit including a first diode, a second diode, a third diode and a fourth diode, the bridge circuit connected to said circuit connector means at a location between the first and second diode and a
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n4:com
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isap:424801458
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isa:351160455
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isap:351502363
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