Menstrual cycle calculator

Method and apparatus for copy-fitting

Method and apparatus for copy-fitting

Method and device for counting cut sheets

Method and means for determining optimum average cycle lengths

Metric-english measurement comparator device

Multi-variable analog computer

Nutrition indicator device

Obstetrics measure and calculator

Radioactive dose calculating device

Slide rule

Slide rule - calendar

Sunlight calculator

Tide and time calculating device

Tide and time calculating device

Time card computer

Time-tape calculator

Vehicle performance computer

Visual display calculator

Weight control calculator