huinventors1-5, Exercise 1: Rating two claims

Model answer:

Holography, Dennis Gábor: secure. He devised the principle in 1947 and won the Nobel Prize in Physics in 1971 for it. The practical holograms came later with lasers, but the principle is his.

Electronic television, Kálmán Tihanyi: disputed or partial. He filed patents in the 1920s for an electronic camera tube, but others, including Zworykin and Farnsworth, also have claims, and the finished system had many contributors.

Any two ratings with a reason drawn from the chapter are acceptable. The ratings are a judgement and the facts should be checked.