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Arthur M. Wengel (1892-1952)

Erfinder des tragbaren Röhrenverstärker-Hörgeräts (Hüls 1999, S. 199)

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Subminiaturröhren-Hörgerät - Set "Maico" Model L

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Intellectual creation Arthur M. Wengel (1892-1952)

Created Maico Co. Inc.

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Intellectual creation
1937 - 1938

1936 1939

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[Last update: 2024/01/16]

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