correct answer is Back spacer pawl.
Back spacer pawl: When you press the Back Space key on a typewriter, the back spacer pawl engages with the teeth of the escapement wheel to turn or push it back (moving the escapement wheel to the right by one tooth spacing), which moves the carriage back one space to the right.
Draw band: Connects the mainspring barrel to the carriage, pulling the carriage toward the left during typing.
Carriage return lever: Used to manually return the carriage all the way to the right for a new line and advance the line spacing cylinder.
Base board: The bottom wooden or metal base frame on which the typewriter rests.