Evidently, you had to do science 35 years ago to determine if you were in the family way. I’ve asked several Baby Boomer friends of mine, but none of them recall this particular pregnancy test kit, or ever using test tubes for results.
45 minutes? That’s a lot of waiting. You can eat dinner and watch a sitcom in that amount of time. And God forbid you dropped a tube, and it shattered. Anyway, times have surely changed for the better.