Hobson Engineering Co Pty Ltd · 2015. 6. 23. · BS 3139: 1959 and in Australia under AS 13157-...
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Hobson Engineering Co Pty Ltd · 2015. 6. 23. · BS 3139: 1959 and in Australia under AS 13157- 1960. Further developments followed with the metric standard BS 4395:1969. Relevant