Comment by omoikane

Lin Yutang had a few patents related to this typewriter, I believe this is the main one:

https://patents.google.com/patent/US2613795A/

The idea of searching for characters via parts is similar to how Cangjie input method selects characters from radicals. I read somewhere that Cangjie input method was indeed inspired by Ming Kwai typewriter, but I can't find the citation for it.