While you can find PDFs online, the wisest move is to download the official Bosch archive file, print two copies, and keep one stored with the tool. The KL 1206 is a heavy-duty workhorse that, with proper maintenance (as outlined in the manual), will outlast many modern plastic-bodied planers.
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Be cautious of third-party sites asking for credit card information. The KL 1206 manual should be free. Bosch Kl 1206 Manual