Photo:

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Description:

New lawn mowers are required to have a safety bar on the handle that must be pulled back in order to start the engine. If you let go of the safety bar, the mower blade stops in 3 seconds or less. This is an adaptation of the "dead man switch" from railroad locomotives.

Categories:

Mistake-proofing category: mistake detection
Setting function: Physical
Regulatory function: Shutdown
Source: Off-the-shelf
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