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The high frequency quenching heat treatment of alloy steel codeword in under the action of external force, in the metal plate to impress a certain depth (0.1-1 mm deep) of letters, numbers, or graphics; after heat treatment of the steel plate can be rotated to a desired letters or numbers, easy words to replace; signet set spacing by special mechanical stepless adjustment; characteristics: small size, light weight, flexible and convenient operation, print neat handwriting, uniform and clear lines, font size, complete and diverse.