[BSLWAC] name authorities change?

Hello, In the latest batch of name authority updates there are a number of records with a change I don't understand.  The new records have a new 700 14 field that is the same as the 100 field. Our III system interprets this 700 as a See also reference.  What is the purpose of this field? Examples: n  79141239 100 1   Housman, A. E.|q(Alfred Edward),|d1859-1936 700 1 4 Housman, A. E.|q(Alfred Edward),|d1859-1936 n  50030817 100 1   Hornung, E. W.|q(Ernest William),|d1866-1921 700 1 4 Hornung, E. W.|q(Ernest William),|d1866-1921 n  79117186 100 1   Von Sternberg, Josef,|d1894-1969 700 1 4 Von Sternberg, Josef,|d1894-1969 Ted Waller Meredith College