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Agricultural machinery and machine tools, implements other than hand operated and machines for agriculture, animal husbandry, horticulture, forestry, earth moving, gardening and plant cultivation as a leisure activity, namely, tilling machines in the nature of harrows, rotary tillers, plows, cultivators, disc harrows, tractor-towed dethatchers, vibrator tillers, tillage machinery with tines, tillage machinery with discs, soil mixers, hoes, soil breakers, soil-compacting rollers, and self-propelled machines for tillage operations; sowing machines, namely, seeders, self-propelled machines for sowing, and planting machines; agricultural hay-making machines, namely, mowers, cutter bars, conditioning mowers, ventilator mowers, conditioners, hay tedders, tractor-towed hay rakes, windrowers, combined tedder and windrower machines, swath groupers, windrow turners, disc rakes, and band swathers; agricultural self-propelled machines for mowing, tedding, windrowing, and cutting produce, particularly plants; agricultural harvesting machines, namely, harvesters, combined harvester-threshers, balers, bale wrappers, and forage harvesters; self-propelled machines for silage loading; treatment machines, namely, spraying machines and self-propelling machines for treating crops; agricultural spreading machines, namely, fertilizer spreaders, manure spreaders, slurry spreaders, bedding machines, salt spreaders, sand spreaders, and self-propelled machines for spreading fertilizers; machines for preparing cattle feed, namely, silo unloaders, mixing machines for feed preparation, fodder dispensers, and self-propelled machines for distributing fodder or preparing cattle feed, namely, self-propelled fodder blender-distributors and self-propelled unloader-blenders; power-operated machines for the maintenance of grass areas, namely, grinders, brush cutters, and roadside mowers; power operated machines in the nature of tree pruners; earth-moving machines; lawnmowers; parts or components of these machines, namely, replacement parts thereof for the above-identified machines