Conversation so far:
What was Alexander Graham Bell's first invention?
creating a simple dehusking machine.
Was his first invention successful?
dehusking machine that was put into operation and used steadily for a number of years.
How old was he when he invented the dehusking machine?
at the age of 12, Bell built a homemade device that combined rotating paddles with sets of nail brushes.

Question: Did anyone help Bell invent the dehusking machine?
Self-contained rewrite: Did anyone help Alexander Graham Bell invent the dehusking machine?