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Practical Wireless, April 8, 1933.

Valves advertised:
215SG, 220SG, 220VSG, 210RC, 210HL, 210HF, 210DET, 210LF, 215P, 220P, 220PA, 230XP, 230PT, 220HPT, 220PT, 210DG & 240B.
    
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