Early on Millers were doing the single triggers for the NID. Up thru the 1930-31 catalogues the text just says "Selective Single Trigger." Beginning with the 1931-32 Catalogues the text says "Ithaca Selective Single Trigger" which I mark as the beginning of the use of the Howland-designed trigger (Patent No. 1,818,852 granted August 11, 1931). Walter may have some more precise info as to when the change actually happened on the guns.

With the 1932 catalogue Ithaca began offering the non-selective Ithaca single trigger as well. This was eventually covered by Howland's Patent No. 1,987,402 granted January 8, 1935.