An aldehyde differs from a ketone because of its hydrogen atom attached to its carbonyl group, making aldehydes easier to oxidize. Ketones don't have a hydrogen atom bonded to the carbonyl group, and are more resistant to oxidation.
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They founded Garmin in 1989 in Lenexa, Kansas, as ProNav. ProNav's first product was a GPS unit which sold for US$2,500. The company was later renamed Garmin, an acronym of the first names of its two founders, Gary Burrell and Min H. Kao. In 1991, the U.S. Army became their first customer.