I think that the document that you need to research is the takeover provisions contained within the Corporations Act. That spells out the rules as to when a new bid can be made. From memory, I think that they have to wait a few months before launching a fresh bid. Acceptors of the original bid would not be beneficiaries of any improved offer in that instance.
AGO Price at posting:
4.2¢ Sentiment: Sell Disclosure: Not Held