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AVO All Wave Oscillator Signal Generator. Wireless engineer's workshop / laboratory must have of the 1940s Stock Photo - Alamy
Vintage radio/audio equipment comprising Avo RF signal generator type HF133, Marconi universal bridg
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AVO All Wave Oscillator Signal Generator. Wireless engineer's workshop / laboratory must have of the 1940s Stock Photo - Alamy
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VCM MK3 AVO Valve Tester / Valve Characteristic Meter In Working Condi – Mullard Antiques and Collectibles
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