B2 multiple entry? ften332004-12-14 03:08:26

My mother-in-law got her B2 yesterday. The visa page showed an "M" under entry, and the visa is valid for 6 months. I wonder if this means she can use this visa to enter the US for several times, as long as within this 6 months.

It seems that B2 is a single-entry visa. Is it normal that her B2 has multiple entry?

Thank you so much.

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我父母来了两次，一次是6个月有效M，一次是3个月有效