B,Professional and technical workers ,
C,Managers and officials ,
D,Clerical and related workers ,
E,Sales workers,
F,Farmers, lumbermen and fishermen,
G,Workers in mining and quarrying occupations,
H,Workers in transport and communications occupations,
I,Craftsmen and production process workers,
,I-1,"Metal material, machine, chemical products workers"
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,l-2,"Silk reel, textile, food, beverage manufacturing workers"
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,I-3,"Construction workers, stationary engine and construction machinery operators"
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,I-4,Other craftsmen and production process workers
J,Labourers,
K,Protective service workers,
L,Service workers,
M,Unclassifiable,