Before revision: The instruments were designed by Doctor Douglas C W Coupland who qualified as a Dental Surgeon in Toronto in 1922 and spent most of his career practising dentistry in Ottawa where he specialised in dental extraction.
After revision: The instruments were designed by Doctor Douglas C W Coupland who qualified as a dental surgeon in Toronto in 1922 and spent most of his career practising dentistry in Ottawa where he specialised in dental extraction.