The Acoustic Bazooka is a 2002 prototype that seems to have dropped out of sight. Whoever created the illustration shown below is an obvious devotee of 1950's sf.
More recently, a device nicknamed the "acoustic bazooka," more formally known as the directed stick radiator... was developed to serve as either a voice-hailing signal device ... The original research effort, however, consisted of equipment development and was not intended to evaluate ... effects on humans. No results of any such testing have been published, to date, in the scientific literature. It has been suggested that the device could "have the capacity to knock people off their feet."
Unfortunately, it appears that the possible dangers of US have been much overrated.
When discussing the practical limitations of technology, however, Altmann suggested that, because of basic physical principles, the development ... is unlikely..."
I think they are missing out on the real potential of super-duper sound energy, anyway. The real use for an Acoustic Bazooka is the removal of obstacles.
Consider the original Acoustic Bazooka - Vavoom from the Felix the Cat cartoon.
'Old People Began to Cross The Continent In Their Own Cars'
'It was a relief to enter one of the comfortable autos, whisper a direction down the tube, and just know that you would be taken to your destination in the quickest, safest, and cheapest manner.' - Dr. David H. Keller, 1935.
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Prairie Madness - And Space Sickness
'Space-sickness is one of the most unpleasant sensations that a human being can experience. Not all are subject to it...'
'Old People Began to Cross The Continent In Their Own Cars'
'It was a relief to enter one of the comfortable autos, whisper a direction down the tube, and just know that you would be taken to your destination in the quickest, safest, and cheapest manner.'
Starfall Manufacturing Drugs In Space
'The vast spinning sphere of Factory in the Sky loomed above and ahead of us, gleaming white against the unfathomable jet depths of surrounding space.'
The Solar Oberth Slingshot
'And if it doesn’t work,' inquired Lazarus, 'what does that make us? Sunspots?'
'If Anyone Is Watching Earth...'
'Our study of your race has convinced us that you are not fitted to leave your planet in the present state of your civilization.'