sentences:  On 1 February 1952 the BOAC Argonaut "Atalanta" G-ALHK transported Princess Elizabeth and the Duke of Edinburgh to Kenya to begin a Commonwealth tour.Some days later, 6 February, it was again "Atalanta" G-ALHK which returned the newly acceded Queen Elizabeth II to England upon the death of her father, King George VI.Rolls-Royce also developed a quieter 'cross-over' exhaust system for the DC-4M, the modifications being supplied in a kit allowing installation on the aircraft by the operator.