Manufacture of the H 53 ROCKET I began in 1968

HARMONY produced the H 53/1 Rocket I between 1969 and 1972

Manufacture of the H 54 ROCKET II began in 1968

Production of the H 54/1 Rocket II began in 1969 and ended in 1972

HARMONY manufactured the H 56 ROCKET VII between 1966 and 1968

HARMONY made the H 56/1 Rocket VII between 1969 and 1972

HARMONY began making the H 59 ROCKET III in 1968

HARMONY produced the H 59/1 Rocket III between 1969 and 1970