From David Beaulieu,
Your Guide to Landscaping.
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Self-propelled lawn mowers require the operator to squeeze a bar to engage the mower....

A. This causes self-propelled mowers to take off -- all you have to do is control the direction in which it goes. If you release your grip on the bar, the mower blade stops spinning. For the higher-end self-propelled rotary mowers, the drive system does not shut off when you release the bar – a convenient feature, in case you’d like to transport the lawn mower from point A to point B without cutting grass along the way.

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