Etymology
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IRS 
also I.R.S., initialism (acronym) of Internal Revenue Service, U.S. federal government tax collection agency, attested by 1954. The office dates to 1862; name changed 1953 from Bureau of Internal Revenue.
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Wankel (n.)
type of rotary internal combustion engine, 1961, from name of German engineer Felix Wankel (1902-1988).
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