Duo Safety Roof Ladder

Duo-Safety Ladder Corporation

Oshkosh, 美国 中的 实验室设备供应商
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Based in Oshkosh, Wis., Duo-Safety Ladder Corporation is one of the largest manufacturers of fire fighting ladders in North America.

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问:
What tests are required?
答:
Refer to N.F.P.A. 1932 - the three basic tests required involve a center load test for ladder strength, a hardware test to verify hardware functionality...
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