EXHIBIT 10.13 THIS SECURITY HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED. IT MAY NOT BE SOLD, OFFERED FOR SALE, PLEDGED OR HYPOTHECATED EXCEPT PURSUANT TO A REGISTRATION STATEMENT IN EFFECT WITH RESPECT TO THE SECURITY UNDER...Interest Purchase Warrant • September 14th, 1999 • Plug Power Inc • Electrical industrial apparatus • New York
