Title:
【考案の名称】学習用のズーム観察鏡
Document Type and Number:
Japanese Patent JPH04109715
Kind Code:
U
Inventors:
Shinichi Nakamura
Application Number:
JP194591U
Publication Date:
September 22, 1992
Filing Date:
January 25, 1991
Export Citation:
International Classes:
G02B21/00; G02B23/16; G09B23/22; (IPC1-7): G02B21/00; G02B23/16