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-4aRev.1-19-67} FEDERAL BUREAU OF INVESTICATION WASHINGTON,D.C.20535 b6 DATE: March 22, 1973 Re: aka; b7C ET AL; TO: SAC, Pittsburgh (182-167) IGB (OO: PITTSBURGH) Invoice of Contents I Crypt.-Trans. Specimens Q1 and Qc2 7 1755w Document P&C Radio Engineering WmIs LFPS (2) SPECIALDELIVERY RETURN RECEIPT REQUESTED Specicl Instructions: FBI File No. 182-1468 Mail Room: Show shipment date and registry number.. Shipping Room: Show shipment date; bill of Iading number;. initial invoice;return to Section checked in block after initialing in blockinvoice to be placed in administrative file. 3/21/73