The first “letters patent”主 were granted謂 as long ago as 1449狀 to a Flemish craftsman賓 by the name of John Utynam定. The letters主, written in Latin定, are系 still on file at the office表. They主 were granted謂 by King Henry VI執行者 and entitled並列謂 Utynam賓 to “import into this country” his knowledge of making stained glass windows賓補 in order to install such windows at Eton College目的狀.
最早的“專利證書”早在1449年就授予了壹個名叫約翰·烏特南(John Utynam)的佛蘭德工匠。
這些信件是用拉丁文寫的，現在仍在辦公室的檔案中。
他們得到國王亨利六世的授權，並被授予烏提南“進口到這個國家”他的知識，制作彩色玻璃窗，以便在伊頓公學安裝這種窗戶。
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