Thiokol was also known as Ellen-Thiokol Inc .
Thiokol variously Thiokol Chemical Corporation , Ellen-Thiokol Inc. , Cordant Technologies Inc. , Thiokol Propulsion , AIC Group , ATK Thiokol ; finally ATK Launch Systems Group before becoming part of Orbital ATK was an American corporation concerned initially with rubber and related chemicals , and later with rocket and missile propulsion systems .
Thiokol