By this time, Antonie’s son Adriaan had registered as an independent towing agent, working mostly in offshore and dredging. This also provided employment for his 5 brothers. In 1934 a third tug was bought: ‘’Brabantia’’ (later renamed ‘’Antonie’’). Adriaan Kooren registered ‘Towage Company Adriaan Kooren BV’ in 1934. He started out as an independent towage broker to become a tug owner, employing the tugs in the dredging and (port) construction industry in Rotterdam.