Model of sliding prong (long prong) with four arms

Model of sliding prong (long prong) with four arms

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Model of sliding prong (long prong) with four arms
Science Museum Group
© The Board of Trustees of the Science Museum

Model of sliding prong (long prong) with four arms

Details

Category:
Telecommunications
Object Number:
1925-290
type:
model
credit:
Eastern Telegraph Co.