I agree, here's their original patent: https://patents.google.com/patent/US1908081A/en https://patents.google.com/patent/US1908081A/en The designers own state

I agree, here's their original patent: https://patents.google.com/patent/US1908081A/en https://patents.google.com/patent/US1908081A/en The designers own statements of requiring "zero vertical angle" to avoid cam-out/throw-out is proof Phillips was designed with it to begin with. The patent change later only added _more_ cam-out/throw-out, it did not introduce it in 1942. Also, the 1942 patent represents the modern Phillips (which is what everyone would acknowledge is the problem screw), where the original 1932 patent looks more like a Reed and Prince.