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The Tosafot on Chullin are based off of tosafot composed by a student of R. Aharon of Regensburg, who was himself a student of R. Yitzhak of Dampierre (see here, based on Urbach's Ba'alei Tosafot). Thus, it seems eminently likely that the R. Avraham ben R. Moshe you see mentioned is R. Avraham ben R. Moshe of Regensburg. Indeed, Urbach (p665) identifies him ...

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