pedigree clause

from The Collaborative International Dictionary of English v.0.48

Pedigree clause \Ped"i*gree clause\
   A clause sometimes inserted in contracts or specifications,
   requiring that a material of construction, as cement, must be
   of a brand that has stood the test of a specified number of
   years' use in an important public work. [Cant, U. S.]
   [Webster 1913 Suppl.]