huinventors1-4, Exercise 3: Budapest to Britain

Model answer:

Bíró developed the pen in Hungary and patented it in the 1930s, including a British patent in 1938. As conditions in Europe worsened he left for Argentina around 1940, continued the work there and patented it again in 1943. During the Second World War the RAF is said to have wanted pens that would not leak at altitude, and a British businessman, Henry George Martin, acquired the rights and began making pens in Britain in the mid-1940s under the name Biro.

To verify: the patent dates and countries, the RAF story (which is often told as legend), the role of Bíró's brother, and the firms and names involved.