yes
John Adams did not own any slaves.
No John Deere does not 'own' On-Star.
none. neither him nor his father ,John Adams, own any slaves
John Deere makes their own lawn tractors(mowers) in Horicon, Wisconsin, USA.
John Deere manufactures their own products
I own a John Deere 1458 mower and it takes an NGK plug #BPR5ES.
John Deere opened up his first blacksmith shop in Grand Detour, Illinois in 1837.
If you own a John Deere tractor, and need an authorized John Deere mechanic to repair it this website may help you. http://www.callbb.com/page.asp?p=What%20we%20can%20do%20for%20you!
John Morton owned just a few slaves.
No, they are competitors.
John Deere did not create the Waterloo Boy tractor, they bought the company in 1918 after they failed to invent their own reasonably priced tractor.
John Deere's own site is probably the best place to get such parts: http://www.deere.com/en_US/parts/partscountry/index.html