The 7D rotary automatic telephone system
Maker and role
Bell Telephone Manufacturing Company, Author
Production date
1930s
Object detail
Accession number
06-056
Signature/Marks and Type
Notes inside. Hand-written
Media/Materials
Physical description
59 p. : illustrations ; 28 cm.
Credit line
Bell Telephone Manufacturing Company. 1930s. The 7D rotary automatic telephone system, 06-056. Walsh Memorial Library, The Museum of Transport and Technology (MOTAT).
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