| Applicant country / location | Applicant | Certificate No | | | Issue date | Manufacturer | Apparatus | |
|---|
| 132 |  Australia |  |
| 2 | Austria | |
| 4 | Belgium | |
| 2 | Brazil | |
| 30 | Canada | |
| 31 | China | |
| 1 | Croatia | |
| 7 | Czech Republic | |
| 16 | Denmark | |
| 31 | Finland | |
| 49 | France | |
| 1 | France Metropolitain | |
| 509 | Germany | |
| 4 | India | |
| 5 | Iran | |
| 15 | Ireland | |
| 3 | Israel | |
| 41 | Italy | |
| 42 | Japan | |
| 115 | Korea, Republic of | |
| 1 | Malaysia | |
| 5 | New Zealand | |
| 21 | Norway | |
| 10 | Poland | |
| 4 | Portugal | |
| 9 | Singapore | |
| 10 | Slovenia | |
| 9 | South Africa | |
| 46 | Sweden | |
| 59 | Switzerland | |
| 16 | The Netherlands | |
| 2 | Turkey | |
| 7 | United Arab Emirates | |
| 444 | United Kingdom | |
| 385 |  United States of America | |
| 1 | | ABB Inc. | |
| 1 | | ABB Inc. (Totalflow®) | |
| 4 | | Adalet/Scott Fetzer Company | |
| 6 | | Adalet/Scott Fetzer Co. | |
| 5 | | ADS Environmental Services | |
| 1 | | AI-TEK Instruments, LLC | |
| 2 | | AMETEK Drexelbrook | |
| 2 | | Amphenol Industrial Operations | |
| 1 | | Apprion, Inc. | |
| 1 | | ASCO | |
| 1 | | ASCO Valve, Inc. | |
| 8 | | Azonix Corporation | |
| 20 | | Baldor Electric Company | |
| 5 | | BENTLY NEVADA | |
| 14 | | Bently Nevada Inc | |
| 6 | | Bently Nevada Inc. | |
| 2 | | Bently Nevada LLC | |
| 1 | | Bently Nevada, Inc. | |
| 1 | | Biomarine-Ntron, Inc. | |
| 2 | | Brodie Meter Co. LLC | |
| 1 | | Brooks Instrument LLC | |
| 4 | | CIRCOR Instrumentation Technologies | |
| 2 | | Clements National Company | |
| 1 | | Coen Company Incorporated | |
| 1 | | Connection Technology Center, Inc | |
| 2 | | Cooper Crouse-Hinds | |
| 3 | | Cooper Crouse-Hinds MTL Inc./ MTL Surge Technologies | |
| 1 | | Cooper Crouse-Hinds, LLC | |
| 1 | | Crystal Engineering Corporation | |
| 2 | | Crystal Engineering Corp. | |
| 1 | | C. E. Niehoff & Co. Inc. | |
| 2 | | Daniel Measurement and Control Incorporated | |
| 2 | | Deere & Company | |
| 19 | | Detector Electronics Corporation | |
| 1 | | Detector Electronics Corp. | |
| 5 | | Dresser Inc., Masoneilan Operations | |
| 1 | | Ebara International Corporation | |
| 1 | | EGS Electrical Group LLC | |
| 2 | | Emerson Process Management | |
| 2 | | Emerson Process Management - Rosemount Analytical | |
| 1 | | Emerson Process Management, Rosemount Analytical | |
| 1 | | Expro Meters, Inc. | |
| 1 | | Fairchild Industrial Products Company | |
| 1 | | FEDD Wireless, LLC | |
| 5 | | Federal Signal Corporation | |
| 1 | | Fire Sentry Corporation | |
| 1 | | Fireye, Inc. | |
| 2 | | Fisher Controls a Division of Emerson Process Management | |
| 1 | | Fisher Controls International Incorporated | |
| 2 | | Fisher Controls International Inc. | |
| 6 | | Fisher Controls International LLC | |
| 1 | | Fisher Controls International, Inc. | |
| 1 | | Fisher Controls International, LLC | |
| 1 | | Flowserve Inc | |
| 1 | | Flowserve US Inc | |
| 3 | | Flowserve US Inc. | |
| 2 | | FMC Technologies Measurement Solutions Inc. | |
| 1 | | Gaumer Process | |
| 1 | | GE-Reuter-Stokes | |
| 1 | | GE Infrastructure Sensing Incorporated | |
| 2 | | GE Infrastructure Sensing Inc. | |
| 1 | | GE Reuter-Stokes | |
| 1 | | General Electric Company | |
| 1 | | General Monitors Inc. | |
| 1 | | Guardian Electric Manufacturing | |
| 1 | | Guardian Electric Manufacturing Company | |
| 1 | | Hamilton Sundstrand | |
| 1 | | Hamilton Sunstrand | |
| 1 | | Hoffman Enclosures Inc | |
| 1 | | Hoffman Enclosures Inc. | |
| 1 | | Honeywell Analytics | |
| 1 | | Honeywell Analytics Inc. | |
| 1 | | Honeywell Enraf Inc | |
| 3 | | Honeywell International | |
| 4 | | Honeywell International Inc. | |
| 1 | | HONEYWELL International Inc., HFS | |
| 4 | | Industrial Scientific Corporation | |
| 3 | | Industrial Scientific Corp. | |
| 3 | | Invensys Systems Inc. | |
| 1 | | ITT Aerospace Controls | |
| 1 | | JB Systems Inc | |
| 1 | | JB Systems, Inc. | |
| 14 | | Joy Mining Machinery | |
| 1 | | Joy Mining Machinery Ltd | |
| 1 | | Joy Mining Machinery, Inc | |
| 2 | | Joy Mining Machinery, Inc. | |
| 1 | | K-Tek Corp. | |
| 1 | | Killark Division of Hubbell, Inc. (Delaware) | |
| 1 | | Killark Electric Manufacturing Co. | |
| 2 | | Kistler Instrument Corp | |
| 2 | | Kistler Instrument Corporation | |
| 3 | | Knappco Civacon | |
| 1 | | Knappco Corporation | |
| 1 | | Leslie Controls, Inc | |
| 3 | | Limitorque, a unit of Flowserve USA, Inc. | |
| 1 | | Martel Electronics Corp | |
| 1 | | Martel Electronics Corp. | |
| 4 | | Metrix Instrument Co. | |
| 1 | | Mettler Toledo Inc. | |
| 1 | | Micro Motion, Inc | |
| 4 | | Micro Motion, Inc. | |
| 1 | | Mine Safety Appliances | |
| 5 | | Mine Safety Appliances Company | |
| 3 | | Mine Safety Appliances Co. | |
| 2 | | Moog Inc. | |
| 2 | | Moore Industries-International, Inc. | |
| 1 | | National Oilwell Varco LLP d.b.a M/D Totco | |
| 1 | | National Oilwell Varco LP d.b.a M/D Totco | |
| 2 | | Ohmart/Vega Corp. | |
| 1 | | OPW Fuel Management Systems | |
| 1 | | Orion Instruments | |
| 1 | | Otto | |
| 1 | | Otto Communications, Div of Otto Engineering Inc. | |
| 1 | | PARKER HANNIFIN CORPORATION | |
| 1 | | PCB PIEZOTRONICS | |
| 1 | | PCB Piezotronics, Inc. | |
| 1 | | Pelco | |
| 3 | | Pelican Products Inc | |
| 3 | | Pelican Products Inc. | |
| 1 | | Physical Acoustics Corporation | |
| 1 | | PMFG LLC | |
| 1 | | PMFG LLC | |
| 1 | | Precision Digital Corporation | |
| 1 | | ProvibTech | |
| 3 | | RAE Systems | |
| 2 | | RAE Systems | |
| 1 | | RAE Systems Inc | |
| 6 | | Rae Systems Inc. | |
| 1 | | RAE Systems, Inc | |
| 1 | | Relcom Inc | |
| 1 | | Rosemount Analytical Gas Chromatograph Division | |
| 2 | | Rosemount Analytical, Gas Chromatographs Division | |
| 2 | | Rosemount Inc | |
| 20 | | Rosemount Incorporated | |
| 3 | | Rosemount Inc. | |
| 1 | | Rotork Process Controls | |
| 2 | | Sentech Incorporated | |
| 1 | | SOR Incorporated | |
| 1 | | Spectrex Limited | |
| 1 | | Spectrex Ltd | |
| 2 | | Sperian Protection Instrumentation LLC | |
| 1 | | Thermo Fisher Scientific | |
| 2 | | Thermon Manufacturing Company | |
| 1 | | Topworx Inc | |
| | | IECEx SIR 10.0136X issue 0 | |  | 12/07/2010 | Topworx Inc | TVA, TXP and TXS Val... | |
| 4 | | Topworx Incorporated | |
| 1 | | Topworx Inc. | |
| 1 | | TYCO THERMAL CONTROLS | |
| 11 | | Tyco Thermal Controls LLC | |
| 3 | | Varec Inc. | |
| 2 | | Veeder-Root Company | |
| 4 | | Veeder-Root Co. | |
| 3 | | Veeder Root Company | |
| 2 | | Veeder Root Co. | |
| 2 | | Versa Products Company Inc. | |
| 1 | | VERSA Products Company, Inc. | |
| 3 | | Watlow Missouri Inc - dba Watlow Hannibal | |
| 1 | | Weatherford International Ltd | |
| 1 | | Weatherford International Ltd. | |
| 2 | | Westlock Controls Corp. | |
| 2 | | WOODWARD Governor Company | |
| 2,068 | | |