registration numbers to the aircraft listed below which are presently under manufacture: ALL ARE KEYSTONE MODEL 9-76C-2 REGISTRATION NO. HELICOPTER CORP., SERIAL NO. I N741A 760741 N743N 760743 N745G 760745 4 N746K 760746 C N7472 760747 N748A 760748 dip N750A 760750 N751E 760751 q N75