It's from Cadance - Specctra Router (formerly CCT-Cooper/Chan)

The .dsn file is an ascii file that includes all the board/comp. data

Michael Kuczynski       Librarian/Sr. Designer
L3 Communications       201-393-2122 (Phone)
Space & Navigation      201-393-6681 (Fax)
699 Rt46E PL1/H13       Mail Stop PL1/J8
Teterboro NJ 07608
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