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发明名称
Density control for photographic enlargers
摘要
申请公布号
US3086709(A)
申请公布日期
1963.04.23
申请号
US19600009265
申请日期
1960.02.17
申请人
SIMMON BROTHERS, INC.
发明人
SIMMON ALFRED;WEISGLASS LOUIS L.
分类号
G03B27/72;G03B27/80
主分类号
G03B27/72
代理机构
代理人
主权项
地址
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