Vintage German line bore measuring device.

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Previously:

Vintage West German wire strippers with unique wire stripping mechanism - GIF
Vintage watchmaker's dividing plate - photo
Vintage Canedy-Otto hand-cranked post beam drill press - GIF
Holding work in a collet chuck on a vintage Warner Swasey turret lathe - photo
Vintage saw sharpening machine working - GIF
Vintage vibrating reed tachometer - GIF
Vintage mechanical calculator - photo
Vintage razor sharpener - GIF