专利名称：Perpetual calendar发明人：Pedro Nicolas Cannarozzo申请号：US05/728400申请日：19760930公开号：US04094082A公开日：19780613
摘要：A perpetual calendar is provided having a frame defining an enclosure with afrontal portion provided with first indicia representing days of a week, and, within theenclosure, seven prisms removably mounted in said frame, and provided with secondindicia located beneath said first indicia representing days of a month.
申请人：CANNAROZZO; PEDRO NICOLAS
代理人：Michael J. Striker
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