BSI BS 2733:1956

Current Revision
Specification. Intrinsically safe magneto-call telephones primarily for use in coal mines

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BSI BS 2733:1956

Specification. Intrinsically safe magneto-call telephones primarily for use in coal mines

PUBLISH DATE 1956
BSI BS 2733:1956

WITHDRAWN

Telephone ringing and speech circuits.

Magneto-generator characteristics, magneto-operated bell.

Coupling unit.

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