0 0 0 – present ▁▁ 1 9 8 0 – 1 9 9 9 ▁▁ 1 9 6 0 – 1 9 7 9 ▁▁ 1 9 0 0 – 1 9 5 9 ▁ ▁Before ▁ 1 9 0 0 ▁ ▁Notable ▁def unct ▁& ▁dissol ved ▁ ▁See ▁also ▁▁ ▁List ▁of ▁companies ▁founded ▁by ▁Harvard ▁University ▁al umn i ▁ ▁List ▁of ▁companies ▁founded ▁by ▁Stan ford ▁University ▁al umn i ▁ ▁List ▁of ▁companies ▁founded ▁by ▁U C ▁Ber keley ▁al umn i ▁ ▁List ▁of ▁companies ▁founded ▁by ▁University ▁of ▁Pennsylvania ▁al umn i ▁ ▁List ▁of ▁Massachusetts ▁Institute ▁of ▁Technology ▁al umn i ▁ ▁References ▁▁ ▁Category : M ass achusetts ▁Institute ▁of ▁Technology ▁Category : List s ▁of ▁companies <0x0A> </s> ▁Power ▁push - over ▁( B unto ver ) ▁is ▁the ▁action ▁of ▁an ▁aircraft , ▁typically ▁a ▁gy ro plane , ▁whose ▁prop eller ▁thrust ▁line ▁is ▁above ▁the ▁center ▁of ▁gravity ▁and ▁la cks ▁an ▁ade qu ate ▁horizontal ▁stabil izer ▁to ▁pitch ▁forward . ▁ ▁Power ▁push - over ▁is ▁caused ▁by ▁the ▁creation ▁of ▁a ▁tor que ▁around ▁the ▁center ▁of ▁mass ▁of ▁the ▁gy ro plane ▁by ▁the ▁force ▁of ▁the ▁prop eller ▁and ▁un loading ▁of ▁the ▁rot or . ▁Un loading ▁of ▁the ▁rot or ▁and ▁subsequent ▁power ▁push - over ▁can ▁be ▁caused ▁by ▁excess ive ▁pilot - indu ced ▁oscill ations . ▁ ▁References ▁ ▁Category : A viation <0x0A> </s> ▁Magyar ▁v ánd or