Alternating tread stairway, lol. I had to contend with one at Reno TESLA plant while we built the battery assembly line. I've been ladder wise long as I can remember, even before USN aircraft carriers, no shortage of those onboard. The alt-tread concept I do not fathom; other than you are forced to use handrails.
Probably invented by a company selling tool belts and backpacks.
Fabulous work area enhancement, provided you don't need instruments and hand tools to accomplish tasks.

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