Context: VINs were first used in 1954. From 1954 to 1981, there was no accepted standard for these numbers, so different manufacturers used different formats.\n\nQuestion: when did they start putting vin numbers on cars?
Use reasoning to answer the following question.
1954
The relevant information to answer the above question is: VINs were first used in 1954.

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So, the final answer is 1954