In 1925, he joined the Department of Agriculture in Freemantle.
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During his period in Western Australia, Filmer, in collaboration with E. J. Underwood, achieved a major research success which was to prove of incalculable benefit to agriculture in New Zealand and throughout the world.
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This clearly foreshadowed the discovery of vitamin B12 and proof that the role of cobalt as an essential trace element is exerted through this vitamin.
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