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US3089746A
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Feed control apparatus for record sheets
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DE1170005B
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Dynamic miniature sound transducer and method for centering its moving coil
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DE1143233B
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Dynamic small listener
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DE1189752B
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Repeater for dictation machines
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DE1106974B
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Use of a magnetic sound recording and reproducing head with two columns
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DE1128168B
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Mounting roller for film-shaped sound carriers
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DE1107960B
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Outlet flap for dictation machines
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DE1106512B
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Tension roll with outlet flap
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DE1101007B
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Mounting roller for film-shaped sound carriers
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DE1103612B
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Voice recorder
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DE1133761B
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Hand microphone for dictation machines
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DE1108289B
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Strain relief
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DE1118986B
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Sound recording and reproducing device
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DE1097162B
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Mounting roller for sheet-shaped sound carriers
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