This chart doesn't show all of the frequency allocations. It's mostly showing who has priority on said frequency and who has secondary rights to not interfere

This chart doesn't show all of the frequency allocations. It's mostly showing who has priority on said frequency and who has secondary rights to not interfere with the frequency priority. There's a third "level" (you can look it up on the FCC's website if you like) that includes things that have low priority (any of the items listed in the chart above supersede them) and are normally low enough power that they will not cause any interference to the primary or secondary frequency holders in the chart. This is why you don't see things like wifi or garage door openers in the chart, but they are part of the band plan, usually under "RF Devices" which falls under Part 15 of the FCC's Code of Regulations.