Magnetic asymmetric antipilferage marker

Magnetic detection means

Magnetic field based power transmission line communication metho

Magnetic field based power transmission line communication...

Magnetic key lock and alarm

Magnetic tamper detector

Magnetically triggered on-board elapsed time indicator

Magneto-optic bubble domain histograph

Malfunction detector system for item conveyor

Manipulation protection for a fire detector

Mannequin

Manual modular pull station

Manually programmable audible alarm system

Margin test switch for photoelectric intruder detection devices

Marker light arrangement for power lines

Master antenna line communication system

Maternity and life time tracking apparatus and method of use

Matrix address system using erase operation

Matrix discharge logic display system

Means for adjusting and for testing a detecting device