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2. Mary Dixon Kies - Wikipedia

   en.wikipedia.org/wiki/Mary_Dixon_Kies

   On May 5, 1809, her patent for a new technique of weaving straw with silk and thread to make hats was signed by President James Madison. [1] Some sources say she was the first woman to receive a US patent, [2] [3] however other sources cite Hannah Slater in 1793, [4] [5] [6] or Hazel Irwin, who received a patent for a cheese press in 1808, [7 ...

3. T-mount - Wikipedia

   en.wikipedia.org/wiki/T-mount

   The T-mount is a standard lens mount for cameras and other optical assemblies. The usual T-mount is a screw mount using a male 42×0.75 (42 mm diameter, 0.75 mm thread pitch) metric thread on the lens with a flange focal distance of 55 mm and a mating female 42mm thread on a camera adapter or other optical component.