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


Use:
Practice mine M20 is used for training personnel in the proper methods and precautions to be observed in the care, handling, laying and arming, booby trapping, and disarming of the high explosive, heavy, antitank mine M15.



Description:
The M20 mine has a squat cylindrical steel casing, externally similar to the high explosive mine M15, but differs by having three filler holes around its periphery, and perforations around the arming plug and secondary fuzing wells, indicative of inert status. The mine is issued empty, with arming plug M4 assembled, but lacking either primary or secondary fuze. It is to be loaded with sand and fuzed in the field. The mine is inert except for the smoke charge and M45 primer in the M604 fuze, the smoke charge primer in the M1 practice activator, and the primer in the secondary fuzing device. The primary fuze is the fuze M604. The secondary fuze wells will accept practice antitank mine activator M1 and any firing device having 9/16 inch threading. A wire carrying handle is provided. The mine, with M604 fuze,
is activated by the weight of an intermediate or heavy tank. Lighter equipment or personnel will not overcome the spring system of the mine and actuate the fuze.

Functioning:
Practice mine M20 is activated by a force of 565 ± 174 pounds, which is sufficient to overcome both spring systems, that in the mine, and that in the M604 fuze. Although intended for interdiction of medium or heavy tanks, the mine can be functioned, when booby trapped, by pull or release, of either of two trip wires attached to a secondary firing device. The activation of the primary fuze or either of the secondary fuzes releases a cloud or smoke and creates a noise, indicative of mine functioning.

Tabulated Data:
Model number.....................M20
Type ...................................Pract, Heavy, AT
Drawings:
Assembly............................7548124
Weight-fuzed & ballasted....31.46 lb
Dimensions:
Height................................ 4.91 in.
Max diam ..........................13.16 in.
Material .............................Steel
Thread:
Arming plug........................2.313-14 NS-1A
Second fuze well ................0.688-12 NC
Fuze ..................................M604

Scan on the right thanks to R. van Doorn.