According to OSHA, fall protection shall be provided when employees are required to work on the leading edge of a roof that is a minimum of what distance above lower levels?
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windy city oil field, karamay, xinjiang, China
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Laying plastic pipes drainage to drain the water around the house of drainage system
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Concrete cube or construction brick and trowel. Construction concept and mason
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Joyful young man construction worker holding mobile phone and smiling while standing by the table with laptop
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