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US4907118A - Visual indicator electrical plug-type surge ...

An inexpensive, compact, portable, visual indicator electrical plug-type surge protector which comprises an electrical plug body composed of a molded transparent polymer, the plug body having an extended male grounding prong and a pair of male electrical prongs on one face and a female receiving grounding inlet and a pair of female receiving inlets on the opposite face.Cited by: 56…

Rotary telephone line surge protector and system - Curtis ...

May 10, 1988 · A rotary telephone line surge protector and system in which surge protector comprises a first and second housing, the second housing containing a grounding plug and non-conductive plug prongs to connect the second housing to a standard AC electrical wall outlet and which first housing is adapted for rotary motion about the central axis of the second housing, and the second housing ……