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Which of the following would be considered a "hard" Poka-yoke or Mistake-Proofing?

Posted: Wed Aug 30, 2023 10:43 am
by answerhappygod
A computer message asking, "Are you sure you want to delete this file?"
An alarm bell that chimes until seat belts are fastened
An electric eye that prevents an elevator from closing on people
A light indicating gas is running low in an automobile