DCSRT18v Cordless, LRT250B, M1G-ZP-250, N1F-GT-240-B, N1F-GT-250-B. For Twin Line Powerbase Models. Powerbase 220W, 250W, 350W (supplied free with mower). Spool & Line. This can be due to the manufacturer changing suppliers during or after a production run of the appliance.
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