Abstract: An apparatus for cutting upstanding agricultural crops includes a plurality of adjacent dynamically balanced rotary cutter assemblies each having diametrically opposed blades the outer tips of which are at unequal distances from the rotary axis, corresponding blades on adjacent rotary assemblies being substantially 180.degree. out of phase.

Abstract: A lawn debris collection system includes a collection box coupled to the outlet of a lawn mower by duct work including an assist blower. The box is mounted for tilting about a pivotal connection between the bottom of the box and a support frame carried at the rear of a vehicle carrying the mower. A manually operable linkage is mounted on the box for selectively releasing a box and door latch members, which respectively hold the box in an upright fill position and the door closed, when it is desired to tilt the box rearwardly to a dump position.