Varley's vacuum protector, 1870

Made:
1870
Varley's vacuum protector, 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