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Architectural Drafting Instrument Patent Prints
These technical drafting tools can be used by architects and engineers for measurement and layout of drawings. Architectural plans and prints need to be immensely accurate and these are the original patents of the tools used to make that happen.
Hugo Hasselquist invented an improved version of the mechanical pencil on Dec 12, 1939.
On November 12, 1929 Ludwig Audrieth invented an improved version of the drafting compass.
On June 13, 1916 Edwin Demmrich invented an improved version of the triangle.
Luther Carmical invented an improved version of a plotting instrument on January 2, 1900.
On January 30, 1894 John Riddle invented an improved version of the protractor.
On March 15, 1881 Thomas Tostevin invented an improved version of a drafting instrument.
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