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Leo Gerstenzang (June 3, 1892 – January 31, 1961) was a Polish-American inventor who, in 1923, created the first contemporary cotton swab or Q-Tips. [citation needed] His product, which he named "Baby Gays," went on to become one of the most widely sold brand names. There are many anecdotes about how Gerstenzang came to create this invention ...
Rotary incremental encoder with shaft attached to its thru-bore opening Introduction to incremental encoders, from VideoWiki script Incremental Encoder. An incremental encoder is a linear or rotary electromechanical device that has two output signals, A and B, which issue pulses when the device is moved. [1]
Many people experimented with rotary blade mowers in the late 1920s and early 1930s, and Power Specialties Ltd. introduced a gasoline-powered rotary mower. Kut Kwick replaced the saw blade of the "Pulp Saw" with a double-edged blade and a cutter deck, converting the "Pulp Saw" into the first ever out-front rotary mower. [10]