Sounds like a simple question, but despite a few hours of searching, I couldn't find the answer.
I would also like to know what qualification was required beforehand in order to work in that profession?
The government board wasn't really helpful, but I found the answer:
For a few years there had been a combined Physiotherapy/ Occupational Therapy Degree course at The University of Queensland. In 1955 the Occupational Therapy three year Diploma course was introduced.