Watchtower 1964 page 352 "....before God cursed it the snake had legs that elevated it off the ground. God transformed its body so that it ceased to have legs and could move on its belly."
Book "Gods Eternal purpose"1974 - "God did not put a curse on the whole serpent family...it had only been victimised by Satan..."
After 100 years they decided the snake was just a poor victim of the devil.