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    A means of controlling direction and speed by using magnetic contactors and relays.

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    A magnetic contactor used in the incoming power circuit from the main line collectors.

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    A manual switch which breaks the power lines leading from the main line collectors.

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    A power disconnecting means consisting of a magnetic contactor that can be operated by remote pushbutton and can be manually operated by a handle on the switch.

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    A manually operated device which serves to govern the operation of contactors and auxiliary devices of an electric control.

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    Identification of non-interchange-able parts for reassembly after shipment.

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    A load used in durability calculations accounting for both maximum and minimum loads.

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    An automatic type of friction brake used for controlling loads in the lowering direction. This unidirectional device requires torque from the motor to lower a load but does not impose additional load on the motor when lifting a load.

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    Service classification covered by AISE Standard No. 6, “Specification for Electric Over-head Traveling Cranes for Steel Mill Service".

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    A hoist machine that utilizes an integral drum, motor and gearcase. Also called a "package" hoist, due to the absence of visible shaft couplings between drum, motor and gearcase.

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    A crane in which the hoist is suspended from one or more trolleys that are supported by a single track. Monorail systems allow access to hard-to-reach areas; they are a perfect solution for repetitive production processes or movement of product throughout one facility or multiple buildings.

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    A crane which has two or more girders for supporting the live load.

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    MMA

    The Monorail Manufacturers Association, Inc. (MMA) is an independent incorporated trade association affiliated with the Material Handling Industry. MMA Members produce the preponderance of patented and enclosed track underhung cranes and monorail systems. MMA operates through committees with programs and policies reviewed and adopted by the membership with representation from each member company. Its many activities include an active engineering committee. MMA is represented on a number of standards developing committees and actively supports the development and certification of safety standards by the ANSI consensus method.