Corkscrew may have also been the first coaster with a steel tear drop
shaped loop. Although there where previous loops, the only previous tear
drop was made of wood tracks with a steel structure.
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Nope. That record is claimed by ... either Flip Flap or Loop-the-Loop and was taken by 1901.
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Gemini was the first steel coaster with a wood structure.
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Sorry, SFOT's Mine Ride sewed that one up about a decade beore Gem. Heck, gemini isn't even the oldest wood-supported steelie in the park! Mine Ride is.
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Disaster Transport was the first coaster with a solid trough.
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And again, uh uh. Flying Bobs had that one [cypress trough] by 1947. John Miller and Norman Bartlett, I believe.