In 1900, W.C. Coleman needed money to finish law school, so he got a job selling lamps in what is now Kingfisher, Oklahoma. But shopkeepers in Kingfisher had just been burned by a lighting salesman with a sub-par product. So W.C. decided to sell a lighting service instead of the lamps themselves. He drew up contracts with a "no light, no pay" clause and, with the risk reduced, customers signed on.Flash forward to today, and The Coleman Company (based in Wichita, Kansas) offers a broad array of outdoor gear, and sit atop 326 US patents/patent applications as of this moment (short URL = http://cli.gs/ColemanIP).

Eating out while camping has become more sophisticated. Witness their U.S. Patent Application 20090000493, ROTISSERIE OVEN FOR A GRILL from 1/1/2009--
A rotisserie oven. The rotisserie oven includes a cooking chamber, a spit, a motor assembly, and a fuel burning burner. The motor assembly rotates the spit about an axle. The spit is located horizontally in the cooking chamber so that any liquids dripping from any food on the spit do not fall on the burner. The spit may be removed and replaced by a grate and a heat shield. The grate is oriented horizontally inside the cooking chamber and the heat shield distributes heat from the burner evenly about the grate. The rotisserie oven may be configured to be removably attached to a grill.
The inventor is one Robert Mosher, who also has an earlier patent application entitled OUTDOOR GRILL WITH INTERCHANGEABLE MODULAR COOKING ASSEMBLIES.
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