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ORIGINAL PATENT APPLICATION NUMBER 320,905 FOR IMPROVEMENTS IN OR RELATING TO AUTOMATIC OF SEMI-AUTOMATIC TELEPHONE SYSTEMS., (LONDON).

Author Esmond Philip goodwin Wright, John Henry Elvidge Baker., and Christopher Merrill Colebrook. Standard Telephones and Cables Ltd.
Publisher HMSO
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Book Details
PublisherHMSO
ISBN / ASINB003TI4VZA
ISBN-13978B003TI4VZ7
Sales Rank99,999,999
MarketplaceUnited States 🇺🇸