R B1/B2 Visa Rentry during term of Visa.

[Daryoosh Matsudaira]

One of my friends has a Chinese national with a visa that expires on Aug 2015. The kind of visa is a R B1/B2 (this is what is written on the visa).
The friend has already visited the USA on this visa once and is requesting if it is possible to visit again if the visit takes place before the visa expires.
I believe there is no problem but since it does not clearly say multiple entry visa on the visa in her passport I would like confirmation.

Kindest Regards,