Inventions are never simply "made". Often there is a gradual process where someone has an idea, someone else tries it, and then finally someone else, years later, perfects it. I appreciate you've pulled many of these from a click bait "top 10 things you didn't know Australians invented", but many are a bit iffy.
Wifi - Vic Hayes came up with the idea. John O'sullivan, an Australian, improved it. Some credit there, but to say you "invented it", is a little far fetched.
Pacemaker - This one is true, but it wasn't what we imagine a pacemaker to be like today. In 1920 Mark Cowley Lidwill, Australian, put an electrical needle into a dead babies heart and revived it. Is this a pacemaker or a defibrillator? Weird semantics, but I'll give you that one.
Flight Recorder - The first Flight Recorders were made around 1939. The British used Flight Recorders during WW2, to see how and why a plane crashed. In 1953 Warren, an Australian, added voice recording and made the item more durable. Funnily enough these flight recorders were manufactured by *Drum roll* Britain, because no one else in the world gave a fuck.
There's about 5 countries who have claimed to have "invented" or "patented" the Flight Recorder/Black Box. Adding voice recording to an already existent item does not mean you "invented" it.
I'm not even going to google google maps as it's not really a historical bragging point.
Ultrasound - If you mean Ultrasound in a medical sense I.e. For babies then it was made by a Scottish bloke called Ian Donald in 1956. Australians didn't touch Ultrasound until 1962.
A lot of these are stretching the truth very far. You improved a lot of this technology, but to say you invented it is baffling. The Black Box was around 14 years before you touched it. Ultrasound was around 6 years before you touched it. Wifi already existed before John O'Sullivan touched it, but he made it far more reliable.
Again, anyone bragging about inventions is always suspect to people disagreeing because every country claims to have invented everything. Someone will make the theory, a bloke will patent it, someone else across the globe will invent it, another guy in the middle of nowhere will actually test it and everyone of them is claiming to have invented it.