Subj.: OBSOLETE PRODUCTS - LAST PURCHASE (LIFE-TIME BUY)!!! Dear Frequency Devices Customer, This letter is to inform you that Frequency Devices, Inc (FDI) is discontinuing a number of our older filter modules and instrumentation products. We are not able to continue to support these products due to obsolete raw materials and decreasing or in many cases non-existent sales. In an effort to minimize the impact this situation has on our customers, we are sending this notification letter to provide you with a last buy opportunity on the enclosed list of products. FDI IS NOW ACCEPTING "LAST BUY" PURCHASE ORDERS ON THESE PRODUCTS. ALL LIFETIME PURCHASES MUST BE RECEIVED BY FDI ON OR BEFORE FEBRUARY 15, 2000. Our sales history, beginning in July of 1996, indicates that your company has purchased highlighted items on the enclosed list between July 1996 and November 1999. Note that Frequency Devices has also identified a possible replacement product when available. Replacement products typically provide similar or more precise performance characteristics but are not pin-for-pin compatible. Please call if you have any questions. Thank you for your cooperation and understanding in this matter. We appreciate your loyalty towards our products and apologize for any inconvenience this situation may cause. Sincerely,     Gregory T. Anderson President

COMPONENTS   Obsolete P/N Replacement P/N Obsolete P/N Replacement P/N Obsolete P/N Replacement P/N 400 NA 727P1Q10 D64BP2Q10 790BT,LT-8 D68L8B,L 420 NA 728P2Q5 D64BP2Q5 791BT,LT-2 D72L2B,L 440 NA 730BT,LT-1 854L8B,L 791BT,LT-4 D74L4B,L 442 NA 730BT,LT-2 824L8B,L 791BT,LT-6 D76L6B,L 444 NA 730BT,LT-3 824L8B,L 791BT,LT-8 D78L8B,L 534 NA 730BT,LT-4 824L8B,L 792BT,LT-2 D72L2B,L 581-All D51 736BT,LT-1 858L8B,L 792BT,LT-4 D74L4B,L 582 NA 736BT,LT-2 828L8B,L 792BT,LT-6 D76L6B,L 583 D53 736BT,LT-3 828L8B,L 792BT,LT-8 D78L8B,L 584 D54 736BT,LT-4 828L8B,L 793BT,LT-2 D72L2B,L 585 D55 738BT,LT-1 NA 793BT,LT-4 D74L4B,L 630DBA D86 738BT,LT-2 NA 793BT,LT-6 D76L6B,L 651 D68L8E 738BT,LT-3 NA 793BT,LT-8 D78L8B,L 652 D68L8E 738BT,LT-4 NA 794BT,LT-2 D72L2B,L 653 D68L8E 740BT,LT-1 854L8B,L 794BT,LT-4 D74L4B 654 D68L8E 740BT,LT-2 824L8B,L 794BT,LT-6 D76L6B,L 671 D68L8E 740BT,LT-3 824L8B,L 794BT,LT-8 D78L8B,L 672 D68L8E 740BT,LT-4 824L8B,L 795BT,LT-2 D72L2B,L 673 D68L8E 746BT,LT-1 858L8B,L 795BT,LT-4 D74L4B 674 D68L8E 746BT,LT-2 828L8B,L 795BT,LT-6 D76L6B,L 675 D68L8E 746BT,LT-3 828L8B,L 795BT,LT-8 D78L8B,L 676 D68L8E 746BT,LT-4 828L8B,L 796BT,LT-2 D72L2B,L 677 D68L8EY 748BT,LT-1 NA 796BT,LT-4 D74L4B 678 D68L8EY 748BT,LT-2 NA 796BT,LT-6 D76L6B,L 680LP D68L8 748BT,LT-3 NA 796BT,LT-8 D78L8B,L 680HP D68H8 748BT,LT-4 NA 797BT,LT-2 D72L2B,L 700B,L,Y NA 750B,L,Y NA 797BT,LT-4 D74L4B 701B,Y NA 751B,Y NA 797BT,LT-6 D76L6B,L 702B,L,Y NA 752B,L D61L4B,L 797BT,LT-8 D78L8B,L 703B,L,Y D61L4B,L 753BY D61H4B 810P8 820-Oscillator 704B,L,Y D72L2B,L 756B,L D68L8B,L 830PGA D83P 705B,Y D74L4B 757B,L D68L8B,L 844P8B,L,Y-1 854L8B,L,Y-1 706B,L,Y D72L2B,L 760BQ5,10 824BP2Q5,10 844P8B,L,Y-2 854L8B,L,Y-2 707B,L,Y D74L4B,L 762BQ5,10 824BP2Q5,10 844P8B,L,Y-3 854L8B,L,Y-3 708B,Y NA 764BQ5,10 824BP2Q5,10 844P8B,L,Y-4 854L8B,L,Y-4 709B,Y NA 765-11,22,32 D64BP2Q? 844P8B,L,Y-5 854L8B,L,Y-5 710B,Y D72H2B 765-12,23,33 D68BP4Q? 848P8B..-1 858L8B..-1 711B,Y D74H4B 772-1,2,3,4 NA 848P8B..-2 858L8B -2 712B D72H2B 774-1,2 854H8B-1,2 848P8B -3 858L8B -3 713B,Y D74H4B 774-3,4 824H8B-2,3,4 848P8B -4 858L8B -4 719R1Q2 D64BR2Q3 780RT-1 824BR2Q?-2 848P8B -5 858L8B -5 720R1Q2 D64BR2Q3 780RT-2 824BR2Q?-2,3 848P8L-6 858L8L-6 721B,L,Y D66L6B,L 780RT-3 824BR2Q?-3,4 864P8BQ-All 824BP2Q-All 722B,L,Y D66L6B,L 781R1Q2 D64BP2Q2 874P8B,Y-1-5 854H8B,Y-1-5 723B D66H6B 783R3Q3,10 D68BR4Q3,10 878P8B..-1-6 858H8B..-1-6 724B D70H6B 790BT,LT-2 D72L2B,L     725P1Q10 D64BP2Q10 790LT-4 D64L4L     726P2Q5 D64BP2Q5 790BT,LT-6 D66L6B,L     Components Continued The following part number will remain active but not on FDI’s price list or selection guide. 676-fc 705L4L-fc 790BT-4 793BT-8 450 Oscillator INSTRUMENTS   Obsolete P/N Replacement P/N Obsolete P/N Replacement P/N Obsolete P/N Replacement P/N 9064   9016   5016   9064-16 NA 9016 NA 5016/01 NA 9064-32 NA 9016-AM NA 5016PS-1.5A NA 9064-48 NA 9016-RM NA 5016BC NA 9064-64 NA             LPBU8 NA 5016-4FF/D64 NA 32PA-120 NA LPBE8 NA 5016-4FF/D68 NA 32PA-240 NA LPCD8-6 NA 5016-4FF/D70-4 NA 32PB NA LPCE8-6 NA 5016-4FF/D70-6 NA 32PBA NA     5016-4FF/D70-8 NA 32PN NA HPBU8 NA 5016-4FF/D74 NA     HPCE8-6 NA     64DB NA         64FF NA         64FFA NA         64PA-140 NA         64PA-260 NA         64PF NA         64PFA NA