The head holders must hold the suction heads against {HEAD ~ displacement} or excessive deformation in {TAIL ~ the face} of shocks or strains that may be exerted thereon during operation 
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The head holders must hold the suction heads against { HEAD ~ displacement } or excessive deformation in { TAIL ~ the face } of shocks or strains that may be exerted thereon during operation
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH