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A "gin pole derrick" is a derrick without a boom. Its guys are so arranged from its top as to permit leaning the mast in any direction. The load is raised and lowered by ropes reeved through sheaves or blocks at the top of the
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work prepared by an officer or employee of the United States
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Compendium of U.S. Copyright Office Practices). It also does not apply to certain US coins; see
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Commons is a freely licensed media file repository.
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504:Grúa Derrick
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22:File history
234:313.6(C)(1)
109:Description
477:File usage
458:558 × 472
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230:since 1978
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307:此文件中描述的项目
232:. (See §
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157:Licensing
118:English:
53:image/gif
328:gin pole
288:Captions
486:Derrick
445:current
440:Comment
312:depicts
292:English
209:US Code
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101:Summary
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460:(5 KB)
146:Author
136:Source
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122:mast.
437:User
215:Note
128:Date
17:File
466:Z22
268:PDM
395::
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Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
