Drum rotation indicator

Dummy bearing for bearing wear detection

English-metric dial assembly

English/metric indicator unit

Etch timing device

Expandable irrigation signal

Fever indicator

Fill indicator for a vacuum cleaner dust collector

Fire alarm heat sensor

Fire escape light and alarm

Fire extinguisher alarm

Fire extinguisher cabinet

Fire extinguisher support mechanism incorporating an audible ala

First out indicator

Flow indicator with improved biasing assembly

Flow sensor

Fluid container with level indicator, and fluid level...

Fluid flow monitor and indicator

Fluid pressure sensor device

Flywheel impelled cycle signal for appliance