chicago iron workers recreate lunch mystery in the sky a legendary photo lunch atop a skyser the mystery in the sky a legendary photo lunch atop a skyser construction worker on steel beam 1930 chicago iron workers recreate lunch the iconic photo lunch atop a workers on an i beam color version by june is national safety month lunch atop a skyser the construction workers straddling a beam iron construction workers sitting on steel workers on i beam stock image construction workers installing beam lunch atop a skyser the construction workers installing beam two construction workers installing construction workers demolishing the workers fabricating ground beam workers fabricating ground beam group of construction workers construction workers fabricating ground construction workers fabricate ground workers construction roof building factory workers using lifting beam construction site safety then and now low angle view of construction workers safety harness holding steel beam construction workers fabricating ground construction workers removing a beam 1 construction workers on steel beams in