| 21. | This improves efficiency compared to the older side inserted lamp or a double ended lamp which requires two holes.
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| 22. | The ferry is double ended and to support this has two bridges one at either end of the ship.
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| 23. | Binghampton's engine, a double compound marine steam engine is of a symmetrical design, like the double ended ferryboat Binghampton.
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| 24. | The double ended Sanders'0-for-34 slump.
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| 25. | The double ended arrows indicate one-to-one correspondences that exist between the coefficients of the polynomials in the respective nodes.
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| 26. | The waveski rider or waveski surfer uses a double ended kayak paddle for motion while seated in the waveski.
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| 27. | The iron barges used on the canals were long, and were double ended, as they could not be turned round.
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| 28. | Around this time the Yorkshire Patent Steam Wagon company began producing undertype wagons with their distinctive pattern of double ended boiler.
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| 29. | The primary weapon of the Macedonian cavalry was the xyston, a double ended lance, with a sword as a secondary weapon.
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| 30. | The doubles ended with a surprise win by newcomers Gerhard Plankensteiner and Oswald Haselrieder of Italy in 1 minute 42.362 seconds.
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