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

Benjamin valve base

Benjamin valve base

circa 1920s
Valve base

Valve base

Ediswan valve base

Ediswan valve base

circa 1900s
Lissen valve base

Lissen valve base

circa 1920s-1930s
Lotus valve base

Lotus valve base

Telsen Electric Company valve base

Telsen valve base

circa 1920s-1930s
Valve base

Valve base

Valve base

Valve base

Ferranti valve base

Ferranti valve base

circa 1900s