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Maxtorque, Limerick, Maine, No. 413
It’s not easy to open or close a valve on an oil pipeline or water main. That’s where MaxTorque’s gearboxes come in. The guts of a gearbox are pictured here: With the turn of a handle, the cylindrical worm rotates to turn the gear, which opens or closes the valve. MaxTorque expects to sell more than 1,500 gearboxes this year, at prices from $500 to $80,000.