Swing booms saw much use by the Armed Forces in World War II, but were not designed for picking, carrying and placing long sections of pipe for civilian use. Along with sidebooms (read the article Sidebooms, 11429429). other tractor-mounted cranes were developed starting in the 1920s to add the capability to lift and carry a load to a tractor's mobility, be it crawlers on rough terrain, or the industrial wheel tractor over pavement and in industrial settings.
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