＞ 无镀镆球透镜管帽编码原则 (Coding principles for uncoated ball lens cap) ＞ 33GB1515H227C100 (TO33 CAP) Hermetic sealing ＞ 56GB2020H270C150 (TO56 CAP) glass to metal seal/Hermetic seals ＞ 56GB2018H297C100 (TO56 CAP) Hermetic seals ＞ 56GB1515H297C100 (TO56 CAP) Hermetic seals
