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  • K/PP107/11/1-6
  • K/PP107/11/1/20

K/PP107/11/1/20

Dated 1850-1875. From Scientific apparatus, musical instruments and telegraph equipment, [1834-1875].

Resistance box for measuring resistance in length of telegraph wire at intervals of 50 miles.  Consists of a wooden box with brass plates and knobs.

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