As for Dreyfuss citing earlier Sundberg designs as influencial , try looking up the patent for the Remington 26.
I dug around in this for a bit, but didn't see the referenced patent.
- https://patents.google.com/?q=(typewriter);+(remington+model+26)&oq=(typewriter);+(remington+model+26)&sort=old
- https://patents.google.com/patent/USD144164
- https://patents.google.com/?q=(typewriter)&inventor=Henry+Dreyfuss);&oq=inventor:(Henry+Dreyfuss);+(typewriter)&sort=old
- https://patents.google.com/?q=(typewriter)&inventor=Carl+W.+Sundberg);&oq=inventor:(Carl+W.+Sundberg);+(typewriter)&sort=new