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I second that.  Google is creating it's own snippets for the search results rather than using your description because your category descriptions are all the same.  Easy fix.

Matt Cutts has stated before that a dash - in a URL is interpreted similar to a space while an underscore _ is interpreted as a connector. http://youtu.be/AQcSFsQyct8 In your case, if Co-matic and Comatic are synonymous then I would choose whatever the actual Brand name is. Odds are Google will understand 1) that the brand is Co-matic and 2) that "Comatic" is "Co-matic" when looking for machinery. Also, "Comatic" has the dictionary definition "of, pertaining to, or blurred as a result of a coma" which I don't think would be advantageous to have associated with your site.

I agree with Nathan on the canonical tag. You could also work with your developer back end system and look into configuration issues and see if there's a way for the application to always have a consistent product level URL. It's the same product. It's being exposed in multiple categories or multiple levels of categories. Regardless, it's the same product. There's no reason for them to be unique product URLs. See if you can work with them to get rid of the root cause. If not, canonical is definitely the way to go. Unfortunately, there's isn't another way like robots.txt exclusions etc that should be considered.