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  1. O'Brien Corporation (MO) (314) 423-4444

  2. Oak Industries Inc.

  3. OAO America Inc (CA) (800) 736-1712

  4. Ohkura Electric Co.,Ltd.

  5. Orbital Sciences Corp.

  6. Object Automation (CA)

  7. OCA/Optical Corp of America (MA) (508) 481-9860

  8. Ocean Optics Inc (FL) (813) 733-2447

  9. Ocean Sensors

  10. Oceana Sensor Technologies (VA) (757) 426-3678

  11. Octagon Systems (CO) (303) 426-8540

  12. OCV Control Valves (OK) (800) 331-4113

  13. Odessa Engineering, Inc. (TX) (512) 834-4141

  14. ODU-Steckverbindungssysteme   +49-8631-6156-0

  15. OFC Corporation (MA) (508) 655-1650

  16. OG Technology, Inc.  1-734-769-8500

  17. Ogden Manufacturing Company (IL) (847) 593-8050

  18. Ogontz Corporation (PA) (215) 657-4770

  19. Ohaus Corp (NJ) (201) 377-9000

  20. Ohio Oscillator (OH) (330) 683-5075

  21. Ohio Semitronics, Inc. (OH) (614) 777-1005

  22. Ohkura Electric

  23. Ohmart/VEGA (OH) (513) 272-0131

  24. Oi Electric Co.,Ltd.

  25. Okajaki Mfg. Co.,Ltd.

  26. OI Analytical (TX) (409) 690-1711

  27. OIC Valve

  28. Oil-Rite Corporation (WI) (414) 682-6173

  29. Oilgear Company, The (WI) (414) 327-1700

  30. Oilgear Corporation

  31. Okazaki Mfg

  32. OLE

  33. Olflex Wire & Cable, Inc. (NJ) (201) 575-1101

  34. Olin Instruments (CT) (203) 271-4100

  35. OLIS: Online Inst Systms Inc (GA) (706) 353-6547

  36. Olsen Controls, Inc

  37. Olson Research And Development (CA) (619) 558-6050

  38. Oliver Valves Ltd. (TX)

  39. Olympus America Inc (NY) (516) 844-5000

  40. OMB s.p.a.

  41. Omega Engineering Inc (CT) (203) 359-1660

  42. Omegadyne, Inc. (OH)

  43. Ometron, Inc. (VA) (703) 478-3201

  44. Omnex  1-734-761-4940

  45. Omni Controls, Inc.

  46. Omni Flow Computers Inc (TX) (713) 240-6161

  47. Omnidata International Inc (UT) (801) 753-7760

  48. Omnimark Instruments

  49. Omnitech Robotics (CO) (303) 922-7773

  50. Omron Corp.

  51. OMRON Advanced Systems

  52. OMRON Electronics AG

  53. Omron Electronics GmbH

  54. Omron Electronics Inc (IL) (800) 55-OMRON

  55. On-Line Power (CA) (213) 721-5017

  56. Onicon Inc (FL) (813) 447-6140

  57. ONIX Process Analysis Inc. (TX)

  58. Onix Systesms Inc.

  59. ONO SOKKI CO., LTD.

  60. Ono Sokki Technology Inc (IL) (630) 627-9700

  61. Onset Computer Corporation (MA) (508) 563-9000

  62. ONSPEC Automation Control Software

  63. OPC

  64. Open DeviceNet Vendor Association

  65. Operating & Maint Spec (NC) (704) 523-4031

  66. Ophir Optronics, Inc.  1-800-383-0814

  67. optek - Danulat Inc. (WI) (414) 335-4288

  68. Optek Tecnhology, Inc.

  69. Optem International   1-716-223-2372

  70. Opti-Cal (CA) (805) 528-3601

  71. Optical Gaging Products, Inc. +1(800)647-4243

  72. Optical Research Associates 

  73. Optical Society of America

  74. Opticon    1-978-663-6105

  75. Optim Electronics Corporation (MD) (301) 428-7200

  76. Optima Precision Inc.

  77. Optima Reasearch

  78. Optimized Devices Inc (NY) (914) 769-6100

  79. Opto 22

  80. Opto Technology

  81. Opto-Mech Inc (CA) (714) 894-2066

  82. OptoElectronics-Textron (CA) (707) 763-5900

  83. Optomonitor Inc (CA) (415) 967-8992

  84. Optronic Laboratories (FL) (407) 422-3171

  85. Orange Research Inc (CT) (203) 877-5657

  86. Oratech Controls, Inc.

  87. Orbeco Analytical Systems, Inc (NY) (516) 293-4110

  88. ORBINOX Worldwide

  89. Orbisphere Laboratories (NJ) (201) 265-4900

  90. Orbitec Electronics (CA) (408) 663-9127

  91. Oriel Instruments  

  92. Oriental Motor USA Corp (CA) (800) 816-6867

  93. Origin Technologies Corporation  1-256-837-3811

  94. Orion Research (MA) (508) 922-4400

  95. Ormec Systems Corp (NY) (716) 385-3520

  96. ORSI America (MA) (508) 941-0046

  97. Osaka Electric Co.,Ltd.

  98. Osaki Meter Sales

  99. Osco-Inc.

  100. Oseana Sensor Technologies

  101. OSECO Incorporated (OK) (918) 258-5626

  102. Otek Corp (AZ) (520) 748-7900

  103. OTEK Corporation (AZ) (877) 227-6835

  104. OTS Quality Registrars, Inc.  1-713-683-2291

  105. OUP

  106. Oval Corp.

  107. Oven Industries Inc (PA) (717) 766-0721

  108. Oyo Electronics Co.,Ltd.

  109. Oxford Instruments Inc (TN) (423) 483-8405