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joint groove
book.bind.	法国式书脊槽

joint groove: 69 phrases in 16 subjects

Agriculture	2
Architecture	4
Automobiles	5
Bridge construction	2
Chemistry	1
Construction	3
Drilling	1
Electronics	1
Engineering geology	4
Genetics	1
Hydroelectric power stations	2
Metallurgy	4
Nautical	1
Oil / petroleum	1
Plastics	1
Technology	36