Repair of Utensils by a Non-Jew
Question
A coffee machine assembled by a Jewish technician, and after some time another technician came to replace a part in the machine, and there is doubt whether he is Jewish. Should there be concern that the machine now requires immersion of utensils?
Answer
If initially assembled by a Jew, there is no concern that the assembly was nullified by a non-Jew, and there is no need to determine if the second technician was a non-Jew.
Source
Yoreh De'ah, Siman 120
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