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What Were the Major Reasons and Effects of Migrations in the 19th

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What were the major reasons and effects of migrations in the 19th century?


Definitions:

Punch

An impact tool used to drive out pins, rivets, or shafts, or to scribe/mark components for identification.

Return Stroke

The motion of a piston or lever returning to its original position after completing a pressing or striking action.

TPI

Threads Per Inch; a measure of the fineness of threads in screws, bolts, and other threaded fasteners, indicating how many threads exist in a one-inch length.

Light Angle Iron

A piece of iron or steel formed into a 90-degree angle that is lightweight and used in construction or manufacturing for bracing or framing.

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