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11
Non-Commercial Use
11
Category
Telecommunications
6
Electronic Components
3
Experimental Chemistry
2
Object type
switching unit
11
Maker
Power Equipment Company Limited
3
Electronic Instruments Limited
2
Electronic Instruments Ltd.
2
Ferranti Limited
2
British Thomson-Houston Company Limited
1
Place of origin
United Kingdom
3
Richmond
2
Richmond, Richmond upon Thames, Greater London, England, United Kingdom; Surrey, England, United Kingdom
2
Surrey
2
England
1
England, United Kingdom
1
Date
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Mercury switch
circa 1950
Relay switch made by the Power Equipment Co. Ltd
circa 1950
Mercury switch made by the Power Equipment Co. Ltd
circa 1950
Switching unit
Mercury tube switch
Mercury tube No. 9 for switch
Mercury tube No. 9 for switch
Mazda 80W glass starter switch
1950-1960
Ferranti switching unit