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 0 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

Pitt Chemical Multi Clean  Florine Slide Rule  picture
Pitt Chemical Multi Clean Florine Slide Rule


Wales Setup And Operation Estimator Fabricator Circular Slide Rule Chart 1950 picture
Wales Setup And Operation Estimator Fabricator Circular Slide Rule Chart 1950


1948 ? General Electric Tri Clad Motors Slide Calculator Selector Weight Frame picture
1948 ? General Electric Tri Clad Motors Slide Calculator Selector Weight Frame


Powered by WordPress. Designed by WooThemes