question about 4 different 1980 coasters with 4 inversions.

ok the corkscrew at cp was the 1st coaster in the world to feature 3 inversions.the viper at sfdl was the 1st coaster to feature 5 inversions.the vortex at pki was the 1st full circuit coaster to feature 6 inversions.the disasembled shockwave at sfgam was the 1st coaster to feature 7 inversions & dragon khan overseas was the 1st coaster to feature 8 inversions.
now here is my question.now generally i have ridden both steel phantom as well as phantom,s revenge at kw.& since the 2nd half of the ride was changed & renamed pr it is considered a new coaster to me.same thing with the 2 turn of the century coasters when 2 loops were added & renamed the demon in 1980 so i consider the 2 demons as 1980 coasters.now there are 4 coasters that
a)opened up in 1980 &
b)feature 4 inversions.

they are carolina cyclone at pcar as well as oe at wof where even though it is coming down now i have ridden it & then the 2 demons at pga & sfgam.

now here is the question.this question is for older coaster riders like chillforce or whoever was already a coaster enthusiast & traveling around to parks when these 4 coasters with 4 inversions opened up in 1980.
my question is that does anybody know the date in 1980 when these 4 opened up or at the very minimum does anyone know which one was the 1st of the 4 to open up to the public.i went to rcdb.all it says is 1980 for these 4 coasters with 4 inversions but doesn,t say the opening dates.i am trying to find out which one of the 4 opened up first.any old coaster enthusiasts like chillforce or others who were allready traveling around to amusement parks in 1980?the reason is because one of these 4 was the 1st one to feature 4 inversions whichever one opened up first.
any one know.i contacted the parks but they didn,t reply to me.anyone know?i am trying to find this out.
skc2000.