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Harbey Hubbell, Incorporated Patents
Harbey Hubbell, Incorporated
Bridgeport, CT
No. of patents:

Patent Number Title Of Patent Date Issued
4091431 Ground leakage relay circuit May 23, 1978
A ground leakage relay circuit including a core balance transformer through which pass the supply and return line of the circuit to be protected and having a multi-turn secondary winding. A capacitor is connected to be normally charged from a d.c. source. A normally conducting transistor

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