Mechanical Filters, April 1969 Electronics World - RF Cafe
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Collins 455 kHz Mechanical Filter
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COLLINS Mechanical Filter F455-FD-19 526-9691-020 455 kHz CF 1.9 kHz BW - BLUE | eBay
Mechanical Bandpass Filters for I.F. Ranges, February 1953 QST - RF Cafe
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526-9403-000-8638 Collins Mechanical Filter Lower Sideband 2.9 @ 1.5dB Bandwidth (NOS) Type F92Z-7
