AT THE DIRECTION OF MSHA TECH SUPP PERSONNEL, ANMSHA USHAPED LOAD CELL WAS BEING USED IN CONJUNCTION WITH A JENMAR LOAD CELL TO TEST INSTALLED LOAD OF TENSIONABLE CABLE BOLT. DURING THE TEST THE MSHA LOAD CELL PARTIALLY COLLAPSED & WAS PROPELLED FROM THE ROOF BOLT ASSEMBLY STRIKING THE JENMAR EE IN THE FACE AREA.