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5 answers

they are automatic chain up for snow and ice

2007-07-31 04:07:47 · answer #1 · answered by harold b 1 · 1 0

They are also found on school busses.. They are automatic tire chains... the arm holding them moves & places them under the rear wheels for traction...

2007-07-31 11:09:16 · answer #2 · answered by justme23005 2 · 0 0

They are tire chains for driving in the snow.

2007-07-31 11:09:09 · answer #3 · answered by Anonymous · 0 0

Snow chains, and some are used for anti-static.

2007-07-31 13:27:15 · answer #4 · answered by smittybo20 6 · 0 0

They are static electricity to earth chains it is important that there is no static electricity interfering with medical equipment. ~~

2007-07-31 13:29:20 · answer #5 · answered by burning brightly 7 · 0 0

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