What are these hybrids from National Semiconductor?
The NH prefix doesn't mean they are hybrids.  There's an article in March 1970 Electronics World magazine (https://www.americanradiohistory.com/Archive-Electronics-World/70s/1970/Electronics-World-1970-03.pdf) that lists the NH0009 as being a clock driver IC.  I couldn't find a listing for the NH00012 anywhere, but I would be willing to bet that it is a similar part.  Several places where I've worked had big shelves of data books, but they all went in the trash when parts data popped up online.  I can't help but wonder if there might be copies hanging around in the basements of libraries of colleges that still teach electrical engineering though.

Actually I have to rescind this answer because I just checked the internet archive’s text copy of the National 1972 MOS IC data book and it says the dual clock driver IC was a MH0009C so this looks like the reference in the EW article was a typo.