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1914 - Australia's first domestic airmail was carried between Melbourne and Sydney by Maurice Guillaux (French aviator).
1919 - First overseas airmail arrived in Darwin from England on board a Vickers Vimy piloted by a WW1 Ace, Ross Smith. 
1924 - The Cobb & Co mail service had its last run.
1930 - Mechanical mail handling was introduced at Sydney Mail Exchange. The first in the world.
1931 - The first 'experimental' airmail flights between Australia and England were completed, with famed aviator Charles Kingsford Smith flying legs of the journey. The aim was to establish a regular airmail service between the two countries.
1945 - A total of 1155 million postal articles were handled.
1954 - The Teleprinter Exchange was introduced - the Telex.
1960 - Coin-operated stamp vending machines were introduced and installed for customer convenience.
1962 - First automatic postal station was installed - Melbourne.
1967 - Introduction of postcodes - four digit number allocated to every mail delivery area in Australia. A giant new $6 million mail exchange building opened in Sydney. Worldwide interest was attracted by the new electronic equipment and technology.
1968 - Postcodes were used on 75 per cent of mail. Post office preferred size specification envelopes were introduced.
1970 - Priority Paid mail services were introduced.
1971 - Surface Air Lifted service was introduced, providing an intermediate service between airmail and seamail.
1972 - Melbourne Mail Exchange operated the first Electronic Letter Preparation Line machines, capable of processing up to 25,000 letters per hour.
1973 - Metric weights and measures were introduced in post offices.
1975 - The Australian Postal Commission - Australia Post - was established to replace the Postmaster-General's Department.