Trefot (instrument) (Swedish Wikipedia)

Analysis of information sources in references of the Wikipedia article "Trefot (instrument)" in Swedish language version.

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1antiquesurveying.com

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antiquesurveying.com

Tripod Thread Sizes of US Makers "Until the 3 1/2 inch X 8 threads per inch standard and the 5/8 inch X 11 threads per inch standard were adopted the various manufactures had their own thread sizes."