Cox Beaver 140 was the smallest in the world in 1966
1.4 cu. in. (22.942 cc)
10 lbs.
Mini mac 6 was the smallest in the world in 1970 (smaller than the O&R in size)
ASSEMBLY NUMBER: 600081, serial prefix 10, A10, 11, A11, 12
INTRODUCED: July 1970
DISCONTINUED: May 1973
DISPLACEMENT: 1.78...