发明名称 |
Wheel calculator |
摘要 |
A wheel chart having at least one rigid disk formed by a compact disk which, in addition to having a mirrored or reflective layer capable of carrying reproducible information, has legible matter on an obverse side which cooperates with a member such as a transparent rigid disk which can also bear indicia to enable calculations to be made by relative rotation of the disks.
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申请公布号 |
US2004169070(A1) |
申请公布日期 |
2004.09.02 |
申请号 |
US20040794888 |
申请日期 |
2004.03.05 |
申请人 |
BROMBERG RONALD;WILSON ANTHONY |
发明人 |
BROMBERG RONALD;WILSON ANTHONY |
分类号 |
G06C1/00;G06C5/00;(IPC1-7):G11B7/085;G11B21/08;G06C27/00 |
主分类号 |
G06C1/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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