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- Daburn Electronics
- Dairy Pipe Lines
- DALE
- DANIEL WOODHEAD
- Datak
- DATALOGIC
- DATEL
- Davies Molding
- DAWAR TECHNOLOGIES INC.
- DAWIN Electronics
- DBK
- DBK Enclosures
- DEARBORN
- Decelect Forgos
- DEFENDER SECURITY
- DELEVAN
- DeLorme
- Delphi (FCI Automotive)
- Delphi Connection Systems
- Delphi Connection Systems/Specialty Electronics
- DELTA DESIGN
- Delta Electronics
- Delta EMI Group
- Delta Industrial Power
- Delta Plus
- Delta Product Groups
- Delta Product Groups/Power
- DELTA PRODUCTS CORPORATION
- DELTRON
- DELTRON EMCON
- DEMMEL PRODUCTS
- DENSITRON
- Depew Engineering
- Desco
- Deus Ex Machina Engineering
- Deutsch
- DEWALT
- Dialight
- DIALIGHT CORPORATION
- Dialight Lumidrives
- Dickies
- Dielectric Laboratories
- Digi International
- Digi International/Maxstream
- Digi-Key Corp.
- Digi-Key Evaluation Boards
- DIGI-KEY KIT
- Digi-Key/Cree
- Digital View
- Digital View Inc
- Diodes Inc
- Diodes Inc. / Zetex
- Diodes/Zetex
- Displaytech
- DLP Design
- DLP Design Inc
- Dormer
- DREMEL
- Dresden Elektronik
- Druck
- DUCATI
- DUNOD
- DURACELL
- DURAKOOL
- DURATOOL
- DURATOOL (FORMERLY FROM SPC)
- DYMO
- Dynastream Innovations Inc
- DANIELS
- Dantona
- DANTONA INDUSTRIES
- DATACOMM ELECTRONICS
- Datwyler
- DDK
- DDK Electronics
- Delconec Deltron
- Delkin Devices
- DELL
- Delta Products
- Deltrol Controls
- Del-Tron Precision
- DESCO INDUSTRIES
- DIGILENT
- Digilent Inc.
- Digilent, Inc.
- DIGITAL IDVIEW
- DIGITAL INNOVATIONS
- DIGITRON
- Discera
- D-Link Networks
- Daisen Electoronic Industrial
- Danotherm Electric A/S
- DATASENSOR
- DAYLIGHT
- DBX PROFESSIONAL
- Dearborn / CDT
- DENON ELECTRONICS
- DFX
- DIGIMESS
- DIGISTUMP
- DIGITHEAD
- DINO-LITE
- Diode Laser Concepts
- DIODES
- Diotec
- Display Elektronik GmbH
- Dolan-Jenner
- DONAU
- DONEGAN OPTICAL
- DOW CORNING
- DRAPER TOOLS
- DYNATRON
- DZUS