Australian Constitution - Section 69 - Transfer of certain departments

On a date or dates to be proclaimed by the Governor-General after the establishment of the Commonwealth the following departments of the public service in each State shall become transferred to the Commonwealth:-

Posts, telegraphs, and telephones:

Naval and military defence:

Lighthouses, lightships, beacons, and buoys:

Quarantine.

But the departments of customs and of excise in each State shall become transferred to the Commonwealth on its establishment.