1970's advertisement for the F2 and K2 Allis Chalmers Gleaner Combines from a Demo Pak machine which was used by dealers before VHS. Its basically a narrated slide show.
"Air Flow Grain Saver" ; simplest thing ever . fan to a "Y" air valve and a hanging weight that hung like plumb bob simply moved with gravity and changed the air valve vane directing the air . worked so well , i had to replace hoses on a few as customers LOVED it
Allis Chalmers (and therefore Gleaner) became part of AGCO, who also sells Massey Ferguson. They still make one of the best cleaning, easy to repair combines. They are an evolution of the newer rotor system introduced in the late 70s in the N and R series combines. New ones are the S series.
Back then it was common for small farms to have less than 200 acres. If a 2-3 row combine did the job before the snow fell, there was no reason to spend money on something bigger.
We farmed 450 acres 8n late 70s and 80s. About 400 acres of corn and soybeans plus 12 or so acres of oats. Had an IH 615 with 13' platform and a 2 row 38" corn head. Didn't need a lot of big wagons and we had no trouble getting it done. Didn't have to gobble up all the land on the area to pay for it either.
My dad ran about 300 acres of corn, soybeans, oats and hay. Maybe 25% was in hay and all he had was a 1961 E Gleaner with a 2 row corn head and 10 foot bean head. He milked 35 head of acttle too. It was a lot of work but the E got us through from 1977 through 1997.
Gleaner, at that time, was number one in sales in the United States and had number one resale value. Yes the claims are true. When did IH come with a suspended seat for their combine?