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cert_exam:tech_radio_op_1:a:h27jan:a-17
https://www.icom.co.jp/beacon/backnumber/technical/ama_dig/007.html
https://www.icom.co.jp/beacon/backnumber/technical/ama_dig/008.html
cert_exam/tech_radio_op_1/a/h27jan/a-17.txt · Last modified: by 127.0.0.1