Currency converter for use with pre-established and known conver

Currency exchange calculator

Device for assisting a computer operator in the use of computer

Device for combination of data

Device for resolving interpersonal relationship issues

Device for resolving interpersonal relationship issues

Diagram analyzing device with table of events for combined inter

Diving computer

Emission control calculator

Fertility calculator

Fertility calculator

Feto-maternal calendar calculator

Fluoride supplement calculator

Fly leader slide rule guide

Function calculator with graphic chart facility

Informational device adapted to convert binary to decimal numera

Inhaler with a dose counter

Library late-book fine computer

Mariner's dogleg course distance calculator

Menstrual calculator