OO-M-1689, FEDERAL SPECIFICATION: MOWER, LAWN, GASOLINE POWERED (ROTARY FLAT-KNIFE, 24 THROUGH 60 INCHES, GASOLINE ENGINE DRIVEN) (10 JAN 1973) [SUPERSEDES OO-M-681] [NO S/S DOCUMENT]

OO-M-1689, FEDERAL SPECIFICATION: MOWER, LAWN, GASOLINE POWERED (ROTARY FLAT-KNIFE, 24 THROUGH 60 INCHES, GASOLINE ENGINE DRIVEN) (10 JAN 1973) [SUPERSEDES OO-M-681] [NO S/S DOCUMENT]., This specification covers heavy duty, industrial, self-propelled lawn mowers with gasoline-engine power-driven cutting blades. These mowers are of the rotary flat-knife type (blade(s) rotating essentially in a horizontal plane) and are either walk-behind or riding-types.