This round slider rule is marked PTT (Dutch Company) and is two sided. It is in very good condition with perfect chromium plating on the centre of both sides. It comes in the original grey plastic sleeve that is also in great condition and with the original Alro and 1972 marked plastic instruction sheet (Dutch) which has some cracks and a small hole in the middle. Both sides have a see-through cursus with hairline. It measures ca 12 cm or 5 inches in diameter. Check the attached video on how to work your vintage man tool : slide rule operation instructions!
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ALRO circular Decibel Slide rule full set large PTT 1972 Holland
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ALRO circular Decibel Slide rule full set large PTT 1972 Holland
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