▁Sund str and ▁ ▁Hart ▁Engine ▁Company ▁ ▁Hart land ▁Engine ▁& ▁Machine ▁co ▁ ▁He ath ▁A ircraft ▁Cor p ▁ ▁He ath - H end erson ▁ ▁He inkel - H irth ▁— ▁Germany ▁ ▁Walter ▁— ▁Germany ▁ ▁Hel wan ▁ ▁H ende e ▁ ▁H erman ▁ ▁Herm es ▁Engine ▁Company ▁ ▁H ew land ▁ ▁H ex ady ne ▁ ▁Hier o ▁Eng ines ▁– ▁Austria ▁ ▁H iller ▁A ircraft ▁ ▁H indust an ▁Aer onaut ics ▁— ▁India ▁ ▁H iro ▁ ▁H irth ▁ ▁H irth ▁— ▁Germany ▁ ▁His p ano - Su iza ▁— ▁France ▁ ▁His p ano - Su iza ▁— ▁Spain ▁ ▁Hit achi ▁— ▁Japan ▁ ▁H KS ▁– ▁Japan ▁ ▁Ho fer ▁ ▁Hol bro ok ▁A ero ▁Supp ly ▁ ▁H oney well ▁— ▁US ▁ ▁Hop kins ▁& ▁de ▁Kil du chev sky ▁ ▁Hudson ▁ ▁H urr icane ▁Mot ors , ▁Inc ▁ ▁I ▁▁ ▁I . A e . ▁ ▁Italian ▁American ▁Motor ▁Engineering ▁ ▁I HI ▁ ▁Imperial ▁Air plane ▁Society ▁ ▁Indust ria ▁Aer onaut ică ▁Rom ână ▁– ▁Roman ia ▁ ▁I TP ▁– ▁Spain ▁ ▁IL ▁ ▁International ▁ ▁International ▁A ero ▁Eng ines ▁– ▁Mult in ational ▁ ▁Ir win ▁ ▁Isaac son ▁ ▁I sh ik aw aj ima - Har ima ▁He avy ▁Indust ries ▁— ▁Japan ▁ ▁Is ot ov ▁ ▁Is otta ▁F ras ch ini ▁— ▁Italy ▁ ▁Italian ▁American ▁Motor ▁Engineering ▁– ▁Italy