4. Geometrical instruments

Arnold M. Ladd

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Connector assembly for telephone distribution equipment

Geometrical instruments
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Network interface device for line testing

Electrical connectors – With selectable circuit – e.g. – plug board – Test panel
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Overload protector for telecommunications systems

Electricity: electrical systems and devices – Safety and protection of systems and devices – High voltage dissipation
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Overvoltage protector unit for well constructions

Electricity: electrical systems and devices – Safety and protection of systems and devices – High voltage dissipation
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Protector unit

Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific current responsive fault sensor
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