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What a Pipe of Water Can Do. When the conductor in a hydraulic elevator wants the cage to go down,
UMG25A06_064

What a Pipe of Water Can Do. When the conductor in...

How an Elevator Goes Up and Down. There are two kinds of elevators today. the hydraulic, which is
UMG25A06_063

How an Elevator Goes Up and Down. There are two ki...

At the close of the day. Waiting for the cage to go up. Pennsylvania Coal Co.,.  1908
UMG20A58_335

At the close of the day. Waiting for the cage to g...