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What's the “ORegon 7-1222” on R' Moshe Feinstein's letterhead? [closed]

The English part of of R' Moshe Feinstein's letterhead reads as follows: RABBI MOSES FEINSTEIN 455 F.D.R. DRIVE New York, N.Y. 10002 __ ORegon 7-1222 See for instance this letter, this ...