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I think what you are asking is known as "Two Block". This is a situation with a crane or hoist where the lower "block" is raised to the point where it contacts the upper "block"(or hoist, or boom). Originally nautical referring to two pulleys or blocks. In this situation, movement would immediately cease, and the cable could break, causing the lower block and its load to fall. Modern cranes and hoists have upper limit switches to prevent this from happening.
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