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The Circular Saw was invented way back in the early 1920s by a company that later changed it name to Skil. The tool was SO POPULAR that for decades people referred to every circular saw as as "skil saw", which is the same kind of thing that happened with Hoover. The company name became synonymous with what it did. Even today I hear people sometimes calling circular saws "Skil Saws" and if you tell someone you need to do some "hoovering" they know you really mean vacuum cleaning. Funny how that goes ... but I digress. The circular saw is arguably one of the most popular power tools on the planet. The only thing that might bump it would be the power drill.
Sadly, circular saws have created a TONS of injuries over the years and thanks to a number of people who have looked at these injuries and come up with good ways to help prevent them in the future, we now have a pretty good guidelines on circular saw safety. I am happy to report that these guidelines and best practices are being taught to our carpenter and woodworking students in trade schools and colleges and we know what they are learning is working because we can monitor the positive results.
Many, many years ago the first blades I ever used on circular saws were old hardened steel blades and they didn't stay sharp very long. You had lots of choices back then too, you get a blade with 20 or 24 teeth depending on what manufacturer you wanted to purchase from. The good news was that you got pretty good a sharpening your own blades with rusty old file ...