Machine tool dial assembly
Magnetically operated door chime
Magnetically operated warning device
Maintenance alarm actuator
Manual release and test apparatus for alarm system
Maximum temperature-indicator
Measuring instrument indicating mechanism
Mechanical door chime powered by motion of the door
Mechanical motion sensor
Mechanical warning device
Moisture gauge for a hanging potted plant
Mounting for audible signal valve knob
Movement indicator
Multi-depth acoustic signal generating device
Musical tea kettle