Antique radios, Old Time Radios
R4B_MO
Country:
Great Britain (UK)
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Identical to |
R4B_MO
= R4B_BTH
= R4B_Marconi
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First Source
(s) |
1918 : British Radio Valves - The Vintage Years: 1904-1925 p.26
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Predecessor Tubes |
R4A
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