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Patent:US2239524


Patent:US 2239524
Title:Recording apparatus
Date:22.04.1941
Place:Oak Park und Berwyn, IL und New York
Country:USA
Person:Johnstone, Harold G. (P) Norbert Karl Engst
Company:Western Electric (P) Comp.
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Link to the patent office:
(without guarantee)
 US2239524 (espacenet),  US2239524 (uspto)


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