About the Tractor and Machinery Association of Australia The Tractor and Machinery Association of Australia is a member based industry organisation which was established over 40 years ago to represent the interests and development of importers, manufacturers and sellers of agricultural tractors and machinery in Australia. With members representing every facet of farm machinery, the TMA speaks as one voice for the industry on issues relating to government regulation and legislation, industry training and development and market sales statistics for the industry and its members.