Dietary monitoring system
Digital clock or other counting device
Digital display mechanism for clocks and the like
Digitally indicating clock-timer
Direction sensitive counting and switching device
Directional person counting apparatus
Discriminating apparatus for moving translucent sheets
Distance indicating device
Dosing counter
Drinking water filter
Drive mechanism for a mechanical counter
Drive sequencing mechanism
Drive system for automatic meter reader
Drop discriminator system
Duplex counting machine
Duplex counting machine
Elapsed time recorder
Electric panel instrument assembly
Electric revolution counter
Electric-set numbering wheel