"American-made imports reached a high point in 1930, when approximately 25 percent of Soviet imported goods came from the United States. (..) By 1931, there were 134 signed technical aid agreements, the vast majority of them with American companies, servicing virtually every branch of the economy (...) General Electric had been eager to reenter the Russian market as early as 1922 to prevent German competitors from preempting it. Their granting of credits for up to five years, credits which were not guaranteed by the United States government, caused a sensation in the United States and signaled greater willingness by capitalist firms to take risks in the Soviet market (...) In 1913, there had been only some 600 tractors in all of Russia, mostly of German make; by 1930, there were 60,000, three quarters of them manufactured in the United States."
https://sci-hub.cc/https://www.jstor.org/stable/178483
And of course, 1933 was when Roosevelt officially recognized the USSR.