What are the part numbers for the original brick minifigures?

Question

I was gifted two containers of assorted LEGO bricks that had some of these:

Apparently these were only made for a few years before the minifigures we know now appeared in 1978. Does anybody know the part number for the legs, torso, and faceless head?

Slightly more info found here: https://en.wikipedia.org/wiki/Lego_minifigure#History

Answer 1

Here are Bricklink entries for the:

• legs (#15)
• torso (#17)
• and head (#3626a)