Definition of purchaser:
A person or corporate body (legal person), who places an order with the manufacturer.
In contrast to that, the manufacturer is a person or corporate body (legal person), who manufactures cast parts.
At the point of order, the purchaser must specify binding order information to the manuracturer. However, it is also possible to agree additional optional order information between the manufacturer and the purchaseer at the time of order (see Order, Order check list).
EN 1559-1:1997, Founding - Technical conditions of delivery - Part 1: General
DIN EN 10204:2004, Metallic products - “Types of inspection documents”