Key-operated instrument

Key-operated instrument

Buy this image as a print 

Buy

License this image for commercial use at Science and Society Picture Library

License

Science Museum Group
© The Board of Trustees of the Science Museum

Key operated instrument for switching out, key missing

Details

Category:
Signalling & Telecommunications
Object Number:
1964-330/52
type:
switching out instrument
credit:
Tyer and Company Limited