Accumulating whistling vent

Acoustic indicator of vacuum level in containers

Activating mechanism for flashlamp article

Activation indicator for a fire detector

Air cleaner with restriction indicator

Aircraft tail stand warning system

Alarm

Alarm device

Alarm device for a campsite

Alarm device for respirators

Alarm for deep freezer

Alarm system

Anti-burglar sound emitting device

Anti-pickpocket warning device

Apparatus for checking the level of liquid in containers

Apparatus for monitoring the condition of a filter

Apparatus for visually indicating when a pool filter is dirty

Assembly for indicating translational movement of a member selec

Audible push-up detector

Audible signal valve knob