But in 2001, Nebraska's governor Dave Heineman tried to block the pipeline because it would run through the state's fragile Sandhills region.

In this paper, it is limited to discuss the ball type gover nor only and the block type governor may be analysed in same way.

The major products are the lift parts such as the car, hoist-way door, door machine , upper sill, speed governor, rope gripper, catch block , buffer etc.