The innovation allowed middle-class Americans to maintain a front lawn in the suburbs is the Mass-produced mowers.
In 1902. this was known to be the year that the the first commercially produced power mower was known to have been made and designed by a man called James Edward Ransome.
Note that an innovation is seen as any kind of tool or machine that tends to make work easy for humans,
Therefore, based on the above, The innovation allowed middle-class Americans to maintain a front lawn in the suburbs is the Mass-produced mowers.
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