[PAR] [TLE] Joseph Whitworth [SEP] Sir Joseph Whitworth, 1st Baronet (21 December 1803 – 22 January 1887) was an English engineer, entrepreneur, inventor and philanthropist.  In 1841, he devised the British Standard Whitworth system, which created an accepted standard for screw threads.  Whitworth also created the Whitworth rifle, often called the "sharpshooter" because of its accuracy and considered one of the earliest examples of a sniper rifle. [PAR] [TLE] William Sellers [SEP] William Sellers (September 19, 1824 – January 24, 1905) was a mechanical engineer, manufacturer, businessperson, and inventor who filed more than 90 patents, most notably the design for the United States standard screw thread.  As president of the Franklin Institute in Philadelphia, Pennsylvania, Sellers proposed the adoption of a system of screw threads which was easier for ordinary mechanics and machinists to cut than a similar design by Joseph Whitworth.  For many years, he led the machine tool firm of William Sellers & Co., which was a very influential machine tool builder during the latter half of the 19th century.
[PAR] [TLE] Joseph Whitworth [ SEP ] Sir Joseph Whitworth , 1st Baronet ( 21 December 1803 – 22 January 1887 ) was an English engineer , entrepreneur , inventor and philanthropist . In 1841 , he devised the British Standard Whitworth system , which created an accepted standard for screw threads . Whitworth also created the Whitworth rifle , often called the " sharpshooter " because of its accuracy and considered one of the earliest examples of a sniper rifle . [PAR] [TLE] William Sellers [ SEP ] William Sellers ( September 19 , 1824 – January 24 , 1905 ) was a mechanical engineer , manufacturer , businessperson , and inventor who filed more than 90 patents , most notably the design for the United States standard screw thread . As president of the Franklin Institute in Philadelphia , Pennsylvania , Sellers proposed the adoption of a system of screw threads which was easier for ordinary mechanics and machinists to cut than a similar design by Joseph Whitworth . For many years , he led the machine tool firm of William Sellers & Co. , which was a very influential machine tool builder during the latter half of the 19th century .
What occupation did both William Sellers and Joseph Whitworth have?
What occupation did both William Sellers and Joseph Whitworth have ?
engineer
engineer