Marking device for fire hydrant or the like

Maximum temperature indicator

Means for protecting underground tanks from damage by dipsticks

Measurement indicating gauge

Measuring instrument

Mechanical fluid indicator

Mechanical meter tampering indicator

Mechanism for indicating when to change engine oil

Medication dosage reminder device

Medication scheduling device

Medicine bottle cap having dosage means

Medicine bottle cap with time and day markers

Medicine management device

Medicine minder

Medicine minder

Memo marking strip

Memory aiding device

Memory assist device with clips

Mercury release alerting

Meter for a vehicle