prior bill of sale

prior bill of sale　居先卖据（与后续卖据对应）　

A bill of sale is a legal document made by a“seller”to a purchaser，reporting that on a specific date，at a specific locality，and for a particular sum of money or other“value received”，the seller sold to the purchaser a specific item of personal，or parcel of real，property of which he had lawful possession.Prior bill of sale is the bill signed in an earlier time.