Environmental protection was an important factor in equipment design .

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The truck was pulled out, but the weight of the towing equipment may have been a factor, the mayor's spokesman says.

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Another factor may have been safety equipment that was installed improperly (as in Britain).

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Oil rig operators and oilfield equipment companies are significantly impacted by the price of oil, a factor over which they have no control.

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Although Hale said the "primary factor" for the shuttle's early return was the weather, he acknowledged the two equipment problems also played a role.

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