It has moved beyond sales pitching or giving out free samples. Must be close to formal JV:- https://books.google.co.uk/books?id=Mwqt9dZoIyQC&pg=PA263&lpg=PA263&dq=trial+orders+manufacturing&source=bl&ots=KKr1GbvtXb&sig=LRGUhinjBQHgJQmZN5hpDC-HNuA&hl=en&sa=X&ei=RICSVbXJN8yU7Qbt1buYDA&ved=0CFcQ6AEwCA#v=onepage&q=trial%20orders%20manufacturing&f=false