Examples from the Web for deere
Joseph Brierton bought it and used it on his farm, and the Deere Company obtained it in 1901.
Deere frendis, this emperour is the Father of Heaven, the whiche made man ere he tooke flesh.
The article then gives the tonnages of iron and steel used by the Deere factory in a year.
There is no mention of Andrus or of an Andrus and Deere firm.
It is probable that from the late 1850's on Deere plows had steel moldboards.