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Non-Commercial Use
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Category
Acoustics
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Object type
pistonphone
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Maker
Brüel & Kjær
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Brüel & Kjær (Sound and Vibration Measurement) A/S
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Place of origin
Copenhagen
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Copenhagen, Denmark
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Pistonphone type 4220 serial no.221377 by Bruel & Kjaer
1960-1979
