Task: Question Generation
Input (English): Context : The Samozaryadnaya Vintovka Tokareva, Obrazets 1940 goda (``Tokarev Self-loading Rifle, Model of 1940'', Russian: Самозарядная винтовка Токарева, образец 1940 года) or SVT-40 is a Soviet semi-automatic battle rifle. 
Subject : SVT-40 
Relation : service entry
Output (English): What year did SVT-40 come into use?