assay office
noun
1- an establishment for the assaying of ores and metals矿物及金属化验室。
1.1
- Brit. an institution authorized to award hallmarks to articles made from precious metals. There are currently four in Britain, at London, Birmingham, Sheffield, and Edinburgh.〈英〉贵金属制品鉴定所（目前在英国有四家, 分别设在伦敦、伯明翰、谢菲尔德和爱丁堡）。