▁strength ▁has ▁been ▁a ▁major ▁focus ▁for ▁Iron M ind ▁since ▁the ▁company ▁introduced ▁its ▁special ized ▁line ▁of ▁g rip - str ength ▁tools ▁in ▁ 1 9 9 0 . ▁ ▁The ▁idea ▁that ▁g rip ▁strength ▁compr ises ▁three ▁basic ▁components ▁– ▁cr ushing , ▁pin ch ing ▁and ▁supporting ▁elements ▁( de ad l ifting , ▁etc .) ▁– ▁was ▁first ▁presented ▁to ▁the ▁world ▁in ▁the ▁ 1 9 9 2 ▁Iron M ind ▁catalog . ▁Iron M ind ▁promoted ▁and ▁further ▁developed ▁this ▁idea ▁in ▁later ▁catalog s . ▁It ▁first ▁published ▁a ▁chart ▁in ▁ 1 9 9 5 ▁highlight ing ▁how ▁g rip ▁strength ▁applies ▁to ▁activities ▁and ▁prof essions ▁r anging ▁from ▁law ▁enfor cement ▁to ▁power l ifting ▁and ▁playing ▁music , ▁and ▁expanded ▁on ▁it ▁in ▁subsequent ▁catalog s . ▁ ▁Two ▁books ▁written ▁by ▁g rip - str ength ▁expert ▁John ▁Brook field ▁and ▁published ▁by ▁Iron M ind ▁– ▁Master y ▁of ▁Hand ▁Str ength , ▁Re vised ▁Edition ▁ ▁( 2 0 0 8 ) ▁and ▁The ▁G rip ▁Master ' s ▁Man ual ▁( 2 0 0 2 ) ▁– ▁also ▁expand ▁upon ▁these ▁basic ▁components ▁of ▁g rip ▁strength , ▁which ▁are ▁now ▁considered ▁as ▁widely ▁accepted ▁fact . ▁ ▁Capt ains ▁of ▁Cr ush ▁G ri ppers ▁ ▁Iron M ind ▁is ▁known ▁world wide ▁for ▁its ▁Capt ains ▁of ▁Cr ush ▁line ▁of ▁hand ▁g ri ppers . ▁These ▁g ri ppers , ▁considered ▁the