Title:
【発明の名称】水中において発音特性を生ずる天然砂の製造方法及び水中発音砂による発音体
Document Type and Number:
Japanese Patent JPH0725606
Kind Code:
B2
Inventors:
Shigeo Miwa
Application Number:
JP19400990A
Publication Date:
March 22, 1995
Filing Date:
July 24, 1990
Export Citation:
Assignee:
Shigeo Miwa
International Classes:
B28D1/32; B24B31/00; B28D1/00; C04B41/00; G10K15/04; (IPC1-7): C04B41/00; B24B31/00; B28D1/00; G10K15/04
Domestic Patent References:
| JP437997U | ||||
| JP56187B2 |
Other References:
【文献】三輪茂雄,自然,第33巻第11号,P.58~63(1978)
Attorney, Agent or Firm:
Takashi Hatakeyama
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