How do I know when to sharpen the blades of my lawn mower?

"Sharp blades cleanly cut the grass. Dull blades roughly tears the grass which will quikly turn brown. If the lawn mower produces teared grass, then the blades should be sharpened or replaced."

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恵 将髙 29-10-2023
ナショナル EY2262
Please tell me when to replace the mower blade and when to sharpen the mower blade. Please tell me how to sharpen it.

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