为了预防假死，欧洲人都设计了哪些棺材？

参考资料：https://historycollection.com/buried-alive-common-victorian-era-doctors-used-10-methods-prevent/
https://www.smithsonianmag.com/sponsored/people-feared-being-buried-alive-so-much-they-invented-these-special-safety-coffins-180970627/