Search for Rife machines. Also, the one we use is the BCX Ultra, which will get you that company. Another search is Spooky2, which is apparently the most competent (their claim). Spooky website has a massive amount of info about the Rife machine and uses. It is also a bit less expensive, but uses a dedicated computer to run their generators and peripheral equipment. We just bought one, but I'm not qualified to make much comment since I've run only one program (terrain). There are others; you'd have to look them over.

I don't believe that using the correct frequencies could be harmful to good cells, but using improper frequencies probably could be. Also there is the concern that a lot of Rife machines are just basic signal generators and only output one frequency rather than the collection. They're supposed to output a carrier wave with the correct frequency overlayed which creates a multitude of sidebands, and it's the sideband frequencies that kill bad cells.

Another machine to look into is the Lakhovsky MWO (multi-wave oscillator). From my limited understanding it also uses frequencies but instead boosts the good cells rather than destroying the bad.

I'm no expert when it comes to the science behind these machines, but seeing two devices that work similarly but slightly differently made me come up with the following (note I could be wrong): The body resonates at a specific set of (likely multiple) frequencies when it is healthy. When it starts resonating out of that range, it becomes unhealthy and disease can take hold. You can either eliminate disease, or amplify health by adjusting what frequency the body resonates at by applying external electromagnetic fields which can interfere either constructively or destructively based on the current frequency of the body and the frequency of the external field.

You know how if you take a bunch of pendulums linked together at their base and start them going at different times, how they'll eventually want to sync up? This is like that. Place the body in a field that's vibrating at the frequency of good health, and the body will naturally start to sync with it and vibrate at the same frequency. Then disease naturally falls away since it can't survive in that environment.

The one bad experience I've had was to use a tinnitis program. I thought I had that, wasn't sure (it's not; it's some crap that's being transmitted from elsewhere), and used it. Frankly, I was screwed up for about 12 hours. Otherwise, I have had no ill effects from the BCX Ultra, and I've used quite a few programs. But that is experiential; I cannot say what others may "know" or surmise. Virtually all we've done (wife, wife's sis, myself) has been quite beneficial, including removal of a skin cancer as stated elsewhere in this thread. I'm sure there are some freqs that can be harmful, but using a Rife properly will preclude that. Also note that the machine called Spooky2 uses a remote; that remote uses DNA to target certain functions from a distance. Can work on more than one person if samples are in the remote. I don't yet know enough about running the thing to make more commentary on it, but do a search and the website has a huge amount of info on Rife etc. Unless a person is using Rife willy-nilly, I doubt much harm can come from it. There is also to be noted that the physics involved is NOT the current inaccurate paradigm you've been taught. You can look up info on Keeley, whose research has been thoroughly suppressed because its basis is frequency and aether physics, which "they" don't want you to know about. Long subject.

For just under 7 years, the BCX Ultra. Not cheap, all contact. I bought a Spooky2 recently, but haven't yet learned enough to do more than 'terrain'. For the BCX: Wife, lower back, intestinal problems, pain relief, edema and other discomforts. Not sure what exactly she does with it, but her statement is, "I wouldn't be without it." There is a general parasite program the three of us use often; however, detox MUST be done after use. Also there's a 'detox aid' program. Wife's sis, who lives on our property: removal/cure of a skin cancer on her cheek (was seeping, previously operated on, now completely gone for almost a year). Knee pain stopped in 1 session (constant problem, does the treatment regularly). She had back operation long ago, metal components, uses BCX for that; hasn't been plagued with back problems for months now. Also, previous operations severed nerves in her left foot; BCX has "healing and regeneration", which she uses regularly, and the nerves in her foot are apparently healing (she has feeling in that foot again). She also uses the pain relief program, and others. Myself: having no particular goals in mind other than a constant intestinal thing (but, after all, I AM nearly 80), I've used the healing/regeneration thing, and parasite program. The parasite program eliminated the intestinal problem entirely, and I reckon I'm more or less 'normal' in that respect now. Also, I had a skin dis-ease from a burn on backs of both hands from about 30 years ago; without targeting that specifically, the skin things have disappeared completely; notably, I did visit a skin doc at the time, he fixed much of it, but it did reappear. As stated, it is gone. Recently sprained a wrist, couldn't do squat with right hand; use of a wrist brace and the healing program fixed that within a day and a half. That's remarkable, since those things usually require a week or more. I've used the edema program, right foot gets swollen occasionally; one treatment fixes that. Also used 'hypertension', which also works, lowering blood pressure a bit (care must be taken, if blood pressure is low, it brings it down more). And there are other items, but I don't recall exactly what. The most dramatic have been the intestinal/parasite, lower back, and the skin cancer. So far.