I would say you need to read the ad carefully to make sure it's simply not mis--stated, or poorly written
What most of us call a "hammer drill" is for masonary drilling, and most can be switched from "hammer" to "conventional drill." A "hammer drill" rotates the bit as well as applying a fast cycling "hammer" action vertically to the bit
What most of us know as an "impact driver" could also be called an "impact wrench" meaning a device which applies a high cycle rate impact ROTATIONALLY to a nut, bolt, etc.
Last would be stuff like a "pneumatic hammer" (air hammer), "needle scaler" or similar. These tools apply ONLY a hammer action to vertically to the tool, no rotational action at all. One popular application would be such as "air chisel" used a lot in muffler shops, body shops, etc, to split metal with a cutter bit.
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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