4 X 5 Film notch question

I've been acquiring a number of negatives from a decesased photoghrapher on ebay which were shot during the late 1940's and early 1950's. The film base has the words Safety Film mechanically embosed next to the notches. The notches themselves are two square cutouts side by side. Anyone have an idea what film this was?

Probably Agfa/Ansco.

http://library.louisville.edu/library/ekstrom/special/AcetateNegativeSurvey.pdf

http://swcenter.fortlewis.edu/tools/NegsID.htm