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B7G valve base with P.T.F.E. insulation

Ediswan valve base

circa 1900s

Lotus valve base

Benjamin valve base

circa 1920s

Telsen valve base

circa 1920s-1930s

Valve base

Valve base

Valve base

Ferranti valve base

circa 1900s

Lissen valve base

circa 1920s-1930s