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keystone, key block, key of an arch crown stone, apex stone; arch keystone; key brick; arch key; vault key; apex stone; capstone (Gewölbe); clavel; clavis; crown; crown stone (Gewölbe); key (Gewölbe); key block (Gewölbe); keystone (Gewölbe); trap; vertex block | |||
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Schlußstein: 2 phrases in 1 subject |
Construction | 2 |