Varley's vacuum protector, 1870

Made:: 1870

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Varley's vacuum protector, 1870
Science Museum Group
© The Board of Trustees of the Science Museum

Varley's vacuum protector, 1870

Details

Category:: Telecommunications

Object Number:: 1888-211

type:: vacuum protector

credit:: H.M. Postmaster General

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Varley's vacuum protector, 1870

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