＞ 镀膜球透镜管帽编码原则(Coding principles for AR coated ball lens cap) ＞ 56GB2020H270C150A131155 (TO56 CAP) glass to metal seals ＞ 56GB1515H297C100A131155 (TO56 CAP) Hermetically sealed ＞ 56GB2018H297C100A131155 (TO56 CAP) Hermetically sealed
