Conversation so far:
What medical breakthroughs did John Harvey Kellogg make?
Kellogg took keen interest in devising instruments for light therapy, mechanical exercising, proper breathing, and Hydrotherapy.
Did he invent any new equitment?
hot air bath, vibrating chair, oscillomanipulator, window tent for fresh air.
how old was he when he started studying medicine?
CANNOTANSWER.

Question: What other information can you give me about his inventions?
Self-contained rewrite: Besides  John Harvey Kellogg inventing the hot air bath, vibrating chair, oscillomanipulator, and window tent for fresh air, what other information can you give me about John Harvey Kellogg's  inventions?