Validity of spouce's previous H4 at the time of second H1 Interview

[rajagp]

Hi,
I have 2 approved H1 Petitions - X and Y.
I am going for stamping of X- H1 petition along with my wife and kid.
So I just want to know in future if I want to go for stamping of Y H1 petition then what will be the validity of the H4 visas of my wife and Kid. Do they need to go for stamping again, or the previous (X) H4 will be valid.

[kabkaba]

The Visa is your own, it is not attached to any employer (even if there may be annotation on the Visa). Neither you nor your dependents need to apply for Visa again even if using a different employer's petition.