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Rule- Rare NOS Slide Rule FERTILITY CALCULATOR 1962 +Info-NIP

This unusual slide rule is Allen's Fertility Calculator, designed to assist or prevent pregnancy. Original pink slip case with pink fold out sheet of instructions. Sparkly little "diamond" marks your cycle type (# of days). Invented by Dr Isamuu Tsuji, based upon the Ogino-Knaus Theory. Copyright 1962-Bunshodo Co., Ltd. Pat. Pending. 6-3/4" long. Never used. One side of pink slip case has some blue areas of color transfer from being stored against another product package and some light grey spots on both sides. Calculator and instructions are in excellent condition.

Price $18.00    Shipping $4.00 -Will Ship United States Lower 48 States Only

Rule- Rare NOS Slide Rule FERTILITY CALCULATOR 1962 +Info-NIP



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Will sell United States Only- Will Ship United States Lower 48 States Only
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