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Ball Variometers, Inc.
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Manufacturers of various styles of variometer as well as supplying all kinds of glider avionics.
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Tasman Instruments
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Produces variometers and combustion engine exhaust gas temperature gauges.
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Filser Electronic GmbH
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Designers and manufacturers of VHF radios, electronic variometers with GPS Receivers and integrated glideslope calculators.
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