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under 60: a robot

60-80: a machine that makes your lawn crap on itself

80 and higher: a propelled machine that you guide across your lawn. it punctures holes about have inch around, and 2 inches deep, in the ground. this allows nutrience to seep deeper into your soil, loosens the dirt, and helps you grow more grass if you are reseeding your lawn
aerator rentals. $50 per hour.
by sushiman09 October 01, 2005