sentences:  Two versions of the mine were built, an 'old' version and a 'new' version.The principal difference being that the 'old' model could be pressure and pull operated, while the 'new' model can only be pull operated.The 'old' version consists of a cylindrical main body with six large fragmentation grooves running around the circumference and two mounting lugs on one side for mounting the mine to a provided metal stake.