REDUCED The Forecaster (1948) Pregnancy Planner Ovulation Prediction Slide Rule For Sale

REDUCED The Forecaster (1948) Pregnancy Planner Ovulation Prediction Slide Rule


This item has been shown 7 times.

Buy Now

REDUCED The Forecaster (1948) Pregnancy Planner Ovulation Prediction Slide Rule:
$42

RARE 1948 menstrual cycle forecasting paper slide rule. Once the number of days in the cycle has been selected on the slide #1, and the first day of flow indicated, then the slide rule calculates the first day of flow in the next cycle and highlights the days when pregnancy can occur. Great conversation piece or ideal gift for your OB/GYN!! Excellent condition and includes the original mailing envelope which is postmarked New York, New York on March 29, 1948. Can't be too many of these out there!


Buy Now

Lot Of 2 &  Book (1) Vintage 1947 Slide K-e No 4181-3 K&e Leather  picture
Lot Of 2 & Book (1) Vintage 1947 Slide K-e No 4181-3 K&e Leather


Rare Watch Pocket Circular Slide Rule Charpentier With Leather Pouch & Doc. 1881 picture
Rare Watch Pocket Circular Slide Rule Charpentier With Leather Pouch & Doc. 1881


Vintage Russian Ussr Engineer Logarithmic Mathematical Circular Slide Rule Kl-1 picture
Vintage Russian Ussr Engineer Logarithmic Mathematical Circular Slide Rule Kl-1


Powered by WordPress. Designed by WooThemes