Not a comb, but this might be of interest... I used to carry an Epibrush when I was in high school (late 80s early 90s). This little gem was sort of like a switchblade hairbrush. It has bristles that pop out with a twist ofa small ring on the handle and pop back in with a touch of a button. It is effectively a self cleaning brush that also was a nice size for EDC. These were around for a few years and then they disappeared. I still have mine, and it still works as good as ever. These days I tend to use a comb to style my hair spmit doesn't get used much but it still has a nice gadget factor I enjoy.