roll bar

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roll bar

[′rōl ‚bär]
(design engineering)
A metal bar installed overhead on a roofless automotive vehicle in order to protect the occupants if the car rolls over.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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Roll bars first became available in the United States in 1971.
A certificate available on its Web site (www.kubota.com) gives Kubota owners up to $50 off the purchase of roll bars (which can cost up to about $350) for many selected Kubota models.
"Roll bars are such a wonderful invention," says Eliot Coleman, an organic farmer who added a roll bar to his older, compact John Deere tractor.