BE420716A
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US1313187A
(en )
1919-08-12
Albert w
BE448946A
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1943-02-27
BE408390A
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BE472400A
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CH497104A
(fr )
1970-09-30
Pastille microphonique à transducteur piézo-résistif
BE434219A
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BE478150A
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BE413645A
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US3275876A
(en )
1966-09-27
Electron discharge device comprising auxiliary electrode in grid section
BE395740A
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BE478101A
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BE405024A
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BE412426A
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CH208624A
(fr )
1940-02-15
Générateur magnéto-électrique avec induit à double prise de flux.
BE410759A
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CH101727A
(fr )
1923-11-01
Dispositif d'émission d'oscillations à haute fréquence.
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