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G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
G01D15/00—Component parts of recorders for measuring arrangements not specially adapted for a specific variable
G01D15/12—Magnetic recording elements
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FR53086D1943-07-081943-07-08
Method and apparatus for recording sounds and recording thus obtained
ExpiredFR53086E
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