| 88215861 | CECO | CECO Environmental IP Inc. | 6185762 |
| 71543887 | CECO | ROBERTSON-CECO II CORPORATION | 0523359 |
| 75026507 | CECO | CECO ENVIRONMENTAL IP INC. | 2078575 |
| 79384455 | CECO | Miss Jen Inc. | — |
| 79251215 | CECO | Roland Küper | 5887711 |
| 88074806 | CECO | CECO USA LLC | 5703216 |
| 88073446 | CECO | CECO USA LLC | 5726334 |
| 79205560 | CECO | Robert Bosch GmbH | 5393465 |
| 97353974 | CECO | Commercial Enameling Co. | 7142302 |
| 88521441 | CECO | MISS JEN INC. | — |
| 76701171 | CECO | Papillon Ribbon & Bow, Inc. | 3927185 |
| 76095548 | CECO | Compressor Engineering Corporation | 2566797 |
| 75333488 | CECO | COMPRESSOR ENGINEERING CORPORATION | 2223814 |
| 73371158 | CECO | Communications Engineering Company | 1261949 |
| 73559453 | CECO | COMMERCIAL ENAMELING COMPANY | — |
| 73098520 | CECO | COMPRESSOR ENGINEERING CORPORATION | 1062105 |
| 72299432 | CECO | COMBUSTION EQUIPMENT COMPANY | 0868679 |
| 72134195 | CECO | COOKE ENGINEERING COMPANY | 0785571 |
| 71517029 | CECO | CONTAINER EQUIPMENT CORPORATION | 0439397 |
| 71464565 | CECO | CECO STEEL PRODUCTS CORPORATION | 0408908 |
| 71463037 | CECO | CECO STEEL PRODUCTS CORPORATION | 0405471 |
| 71126168 | CECO | E. C. Schleyer Pump Company, Inc. | 0135216 |
| 71102902 | CECO | CECO CORPORATION, THE | 0118162 |
