Over a period of 43 years, Best received 41 patents, including an improved
washing machine and
combine harvesters. His first invention, patented April 25, 1871, was a portable
grain cleaner and separator. Farmers had previously had to haul their grain into town to have it cleaned and separated, but the cleaner and separator could now be brought to the grain. The machine won first prize at the
California State Fair in 1871. While continuing to produce grain cleaners, Daniel began working on a single machine that could combine grain
harvesting,
threshing, and cleaning. He sold his first horse-powered combined harvester in 1885, using the money from sales of this machine to invest in work on an improved design for a
traction engine.
Traction engine Best saw the need for an improved
traction engine (now also known as a
steam tractor) to pull his combine harvesters. He first purchased the rights to build a steam traction engine from Remington of
Woodburn, Oregon in 1888, before making improvements to the design. Around 1891, Best began to experiment with
gas engines to replace the
steam engines on his tractors. He developed his first gas-powered tractor in 1896. To prove its superiority, he staged a
tug of war between his steam tractor and his new gas-powered engine, demonstrating that the gas-powered engine could pull the steam tractor around the block. Best's traction engines soon received orders internationally. At this time, Daniel was selling $400,000 worth of machinery per year. ==Family and later life==