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For transport on public roads, the spade tilts the tree to a near-horizontal position in order to clear overhead bridges and cables. A 'tree moving machine' was patented by Howard E. Crawford, of Detroit (Redford Township) in 1961. The patent application was in February of 1958 and the patent was approved and published on July 4, 1961. [4]
Logging methods have changed over time, driven by advancements in transporting timber from remote areas to markets. These shifts fall into three main eras: the manual logging era before the 1880s, the railroad logging era from the 1880s to World War II, and the modern mechanized era that began after the war. [12]
The unit cost of the feller buncher is primary affected by the tree size and the tree volume. [10] The unit felling cost is lower when the tree size increased. For example, tree with 5 inches at DBH has the unit cost of $70 while tree with 15 inches at DBH has the unit cost of $12. As the cost of feller buncher is high, only large tree volume ...
Early spades were made of riven wood or of animal bones (often shoulder blades). After the art of metalworking was developed, spades were made with sharper tips of metal. Before the introduction of metal spades manual labor was less efficient at moving earth, with picks being required to break up the soil in addition to a spade for moving the ...
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