Yes I know Byron.
ADR 10a 1st Jan 1971
ADR 10b 1st Jan 1973
ADR 10b was revised in July 77 and became effective as from 1st Jan 78 from what I have found out.
http://www.infrastructure.gov.au/roa...n/pdf/vol1.pdf
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6/78 HZ.... Note ADR 10b and change to ADR 25a.
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