4. Geometrical instruments

Anthony R. Engelmore

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Rotatable electrical connector for coiled telephone cord

Geometrical instruments
Patent

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Rotatable electrical connector for coiled telephone cord

Electrical connectors – Interrelated connectors relatively movable during use – Movement about axis
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Rotatable electrical connector for coiled telephone cords

Electricity: transmission to vehicles – Collectors – Trolley
Patent

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Rotatable electrical connector for telephone cord

Geometrical instruments
Patent

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Profile ID: LFUS-PAI-P-743820

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