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John Conrad Lighthouse (born (probably) Germany, March 21, 1844; died Rochester, New York, September 9, 1909) was an American businessman and numismatist. Known as "The Horse Collar King", he amassed a famous coin collection.

Early life
Lighthouse's father John J. Lighthouse (1813-1897) was a German immigrant, a boat builder who managed a boatyard at the Ohio Basin in Rochester. The eldest son in a family of ten, by sixteen Lighthouse had become interested in the leather industry. By 1865 Lighthouse had started a tannery and a leather manufactory in Rochester.

Business life
In the early 1880s Lighthouse patented the "Eclipse" halter, which he advertised as having a number of advantages over previous five-ring halters, and the "Maud S." halter, named after a famous race horse of the day. His tannery grew to employ 160-200 employees.

He also had a factory producing horse collars in a variety of materials, so widely sold that he was known as "The Horse Collar King".

Lighthouse also held contracts to provide mail bags to the Postal Service, starting in 1879. As late as 1904 Lighthouse continued to be interested in the business, patenting a mail bag design.