What does OPM stand for?
OPM stands for "Ordnance Proof Manual"
How to abbreviate "Ordnance Proof Manual"?
"Ordnance Proof Manual" can be abbreviated as OPM
What is the meaning of OPM abbreviation?
The meaning of OPM abbreviation is "Ordnance Proof Manual"
What does OPM mean?
OPM as abbreviation means "Ordnance Proof Manual"
