‘commutator’ historical pictures (exact matches)

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Truing an electric motor commutator on a motor-driven bench lathe, south bend
Truing an electric motor commutator on a motor-driven bench lathe, south bend
An early type of Siemens' Self Exciting dynamo with drum-wound armature and bar commutator
An early type of Siemens' Self Exciting dynamo with drum-wound armature and bar commutator
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