Magnetic asymmetric antipilferage marker

Magnetic detection means

Magnetic key lock and alarm

Malfunction detector system for item conveyor

Manually programmable audible alarm system

Margin test switch for photoelectric intruder detection devices

Master antenna line communication system

Means for adjusting and for testing a detecting device

Means for distinguishing motion from noise in an intrusion alarm

Means for sensing change in the amount of fluent material in a r

Mechanically actuable control relay

Medical diagnostic field service method and apparatus

Medical treatment device with a user interface adapted for home

Merchandise display and categorical indicators

Meter dial encoder for remote meter reading

Method and apparatus for creating and detecting alarm condition

Method and apparatus for delivery alarm for livestock animals

Method and apparatus for detecting a blockage in a vapor flow li

Method and apparatus for displaying industrial process control p

Method and apparatus for electronic surveillance of precisely de