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SolderSmoke Daily News: The Collins Mechanical Filter -- An Advertisement from Australia, 1963
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COLLINS Mechanical Filter F455-FD-19 526-9691-020 455 kHz CF 1.9 kHz BW - BLUE | eBay
Polytechnic Resources, Inc Elliptical, PFT, STD Filters for Collins
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Rockwell/Collins Mechanical Filters
Collins 455 kHz Mechanical Filter
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Collins 880N Mechanical Filter - New, Old Stock - XH Radio Labs
