Correspondence Education from Vocational Training Corporation Japan Skills Education Development Center NC Machine Tool Introduction, a set of 4 answer sheets for 4 months. Copies will be sent in an envelope. Please provide your postal code and address for mailing upon purchase. If you provide your LINE ID, I can send photos. Correspondence education, correspondence course, education, NC machine tool, NC machine, NC machining, NC machine introduction, NC machine education, answers, correspondence education answers,