I guess I have to believe you. I can't read Japanese. And even if I could...I would not have too much of a clue...LOL
I recognize the drawings from a training course I did on flow measurement.(Geez, I'm a geek)
By the way, 47th 212 f17 - In NYC, the F train stops at 47th street, but I don't know what the 17 would be in that case, unless it's 5:00 in 24-hour world.