Mystery Sheet Film

I am looking at a 1940s era (late 40s likely 1946-1949) 4x5 B&W sheet film printed "Kodak Safety Film 241". The notch pattern is as follows. (from R-L: Large rectangular cut, large flat, v-notch, large flat, v-notch, small flat, v-notch). Some Ortho films come close, but none I can find have the v-notch, large flat then two v-notches, or the initial rectangular cut, large flat than v-notch.. Any ideas?

V-V----V----|_|
(from R-L: Large rectangular cut, large flat, v-notch, large flat, v-notch, small flat, v-notch)

For example, Kodak Super Speed Ortho Portrait Sheet Film had
V-V-V----|_|
(from R-L: Large rectangular cut, large flat, v-notch, small flat, v-notch, small flat, v-notch)

And Kodak Commercial Matte had
V-V----V-|_|
(from R-L: Large rectangular cut, small flat, v-notch, large flat, v-notch, small flat, v-notch)

Finally, Commercial Process Ortho had
V-V----|_|
(from R-L: Large rectangular cut, large flat, v-notch, small flat, v-notch)

I have a 1945 Kodak Reference Book , and it might be Super Pancro-Press Type B. Notch code is below:

Craig said:

I have a 1945 Kodak Reference Book , and it might be Super Pancro-Press Type B. Notch code is below:
View attachment 305219

Click to expand...

That is it! Thank you. I cold only find a Kodak 1953 reference book online. Interesting. This is one of my dad's old negatives. Mostly he used Ansco Super Pan Press and Super S Pan. Love Photrio!