梶山関山と三浦乾也一門 : 梶山良助没後100年追善、電信用碍子国産化150年記念 = Kajiyama Kanzan, Miura Kenya and his partners : 100 years memorial of died Kajiyama Ryosuke and 150 years memorial of a part insurater for electrical comunication after first domestic production /

梶山関山と三浦乾也一門 : 梶山良助没後100年追善, 電信用碍子国産化150年記念 = Kajiyama Kanzan, Miura Kenya and his partners : 100 years memorial of died Kajiyama Ryosuke and 150 years memorial of a part insurater for electrical comunication after first domestic production /