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A heating, ventilation and air conditioning contractor was working alone while inspecting an air conditioning unit on a flat roof of a converted warehouse when he fell through an unguarded skylight to the concrete floor below.
Two excavator operators were using a tandem lift procedure to transport a 128-foot section of pipe. Both excavators were attached to the pipe with slings. The lead operator lowered his end, detached from the pipe and positioned his excavator on the left side of the pipe.