Musical tea kettle

Oil level indicator for use with damping fluid metering pins

Output air supply hazard annunciator

Particle flow monitor

Particle flow monitor

Particle monitoring system

Passive personal alarm device

Pheumatic alarm for respirator

Plant moisture indicator

Pneumatic control system

Pneumatically powered oxygen pressure loss alarm system

Pointer device for measuring apparatus

Portable event detecting alarm

Portable fire alarm

Portable locking and alarm system

Portable mechanical alarm for doors, windows and the like

Portable mechanical burglar alarm

Portable surface wind indicator

Pressure gauge

Pressure ratio reversal indicator