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замок свода stresses
gen.	quoin
archit.	kay; kayage
cem.	key block
construct.	key; vault head
geol.	keystone (wikipedia.org)
met.	crown of roof
mil.	key-stone of a vault
mining.	arch keystone; key stone
silic.	crown (печи)
tech.	arch key; crown of root; keystone of a vault
замо́к свода
Gruzovik, archit.	keystone of vault
замок ключ свода
seism.	key; vault head

замок свода: 9 phrases in 5 subjects

Caspian	1
General	1
Metallurgy	1
Mining	2
Silicate industry	4