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Uploader determined values for 2021 and 2022 by obtaining Google Patent listings of patents issued on the first Tuesday of 2021, 2022, and 2023, and performing simple subtraction of lowest-value patent numbers. (All U.S. patents have issue dates on Tuesdays.)
A comparatively small number of models (4,000) were the property of the Rothschild Patent Museum until 2015, when they were transferred to Hagley Museum and Library, forming a part of the museum's collection of patent models. With over 5,000 models, the Hagley's is the largest private collection, and second in size only to the Smithsonian's.
Economy designs were supplied to the government, some with Norris's patent adjustment device. On some later low-angle planes with pin-and-hole iron adjustment, the 1913 patent number was used without the 13 suffix. Second patent; Under no. 199,198 of 22 June 1923 Thomas J. Norris patented modifications to his patent adjustment device.
The patent rolls comprise a register of the letters patent issued by the Crown, and sealed "open" with the Great Seal pendent, expressing the sovereign's will on a wide range of matters of public interest, including – but not restricted to – grants of official positions, lands, commissions, privileges and pardons, issued both to individuals and to corporations.
The patent was both granted and issued on February 8, 1802. It was signed by President Jefferson, Secretary of State James Madison , and Attorney General Levi Lincoln . In subsequent years, Simon Willard visited Thomas Jefferson at his home, Monticello , near Charlottesville, Virginia .
Clay pipe dating is the act of dating clay tobacco pipes found at archaeological sites to specific time periods. Pipe bowl found in Kent , southeast England. The circular hole through the tube is slightly off-centre and measures 3.36mm in diameter, and would suggest a rough date of c.1610 AD.
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The middle size is the No. 30 size, and all numbers with the 30 in them have a chuck shank size of 9/32" (7mm) diameter. The biggest size is the No. 31, and all numbers with 31 in them have a chuck diameter of 5/16" (8mm) diameter. A '1' in front of the number denotes a return spring fitted.