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caissonier
caissonier n. 
/keɪsəˈnɪə(r)/ one who works in a caisson.
/keɪsəˈnɪə(r)/ one who works in a caisson.ΚΠ
1903 Strand Mag. Jan. 98/2 The lives of ‘the men in the box’, i.e. the caissoniers, are in the greatest danger.
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