"For example, what does 'FIXED' mean?"
Fixed location, it doesn't move around. Except for Amateur all fixed stations including receiving sites eg. radio telescopes are registered (not necessarily licensed) by latitude and longitude.
"Is it possible to determine who 'owns' a given piece of the spectrum, and what it's being used for?"
That's what the chart tells you.
"The chart leaves a bit to be desired in this respect."
It's only an allocation chart, if you want specific information you have to look elsewhere.
As for the FCC, they don't license government nor military transmitters and receiving stations aren't licensed at all. When it comes to non FCC licenses that's where you the listener come in, specific information is not published by the government and some is highly classified so all available information has been gathered and compiled by people like you and I. That's where this and other internet sites come in, like any database they're repositories of information and the good part is many have forums where we can ask questions when we get stuck.
Consider yourselves lucky people, a few friends and I started monitoring way back before scanners were invented let alone any publications, not even PCs or the internet, we had to do it all ourselves. You might say we were the first Police Call or Radio Reference on a very small scale. When I think back on the analog receivers and homemade converters we used it makes me wonder how we managed to sort it all out. (;->)
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73 de Warren
Amateur Radio KB2VXA
Station powered by atomic energy, operator powered by natural gas.
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