Patents for Inventions. Abridgments of Specifications. CLASS 40 (iv) TELEPHONES and TELEPHONE SYSTEMS and APPARATUS, Electric. Group XXXIX. 1928, 1929, 1930, 1931, Covers Patents 340,001 to 400,000. 3 Sets Bound Together.

Published by Her Majesty's Stationery Office. HMSO., London, 1932
Language: English
Condition: Used - Good Hardcover

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