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Text copied from TM-43-0001-36, 1994 :


Use:
The antitank practice mine M12 (M12A1, M12B1) is used for training personnel in the precautions and proper methods to be observed in the care, handling, laying and arming, booby trapping, and disarming of the high explosive heavy antitank mine M15.



Description:
The M12 practice mine is a flat, cylindrical, steel casing externally similar to the high explosive mine M15. The mine is shipped empty, with arming plug M4 assembled over the primary fuze well, but without primary or secondary fuzes. It is to be loaded with sand and fuzed in the field. The mine is inert, but explosive components will be found in the primary fuze, and if used, in the secondary fuze and activator. The arming plug has a steel shutter which moves from a side position to a center position as the setting knob is moved from SAFE through DANGER to ARMED position. The words are appropriately color coded, green, green/red, red respectively. A wire carrying handle is provided.

Functioning:
Practice mine M12 is activated by a force of 565 ± 174 pounds on the pressure plate of the mine. This force overcomes both mine and fuze spring systems. Functioning of the practice fuze M604 ignites a smoke charge which emits a cloud of smoke and creates a noise. When booby trapped, the mine may be functioned by a pull or by release of trip wires attached to either of the secondary fuzes. Functioning of the secondary fuzes ignites a small smoke charge in the M1 practice activator.

Tabulated Data:
Model number....................M12, M12A1 or M12B1
Type ................................Practice, AT
Drawings:
Assembly (M12A1) ............82-0-136
Weight .............................20 lb
Dimensions:
Height...............................3.5 in.
Max diam .........................13.25 in.
Material ...........................Steel
Thread:
Arming plug well................2.313-14 NS-1
Secondary fuze well ..........0.688-12 NS
Fuzes ... ..........................M604 practice