Before revision: ISSN 0959-7050. p. 85 but the J/APG-1 is clearly different from the AN/APG-1 on the P-61B.
After revision: 1990s1940sISSN 0959-7050. p. 85 but the J/APG-1 is clearly different from the AN/APG-1 on the P-61B.