| # | Name | Location | Applications |
|---|---|---|---|
| 1. | K. W. Michael Siu | 🇨🇦 Toronto, ON, Canada | 1 |
| 2. | K. W. Muth Company, Inc. | 🇺🇸 Sheboygan, WI, United States | 1 |
| 3. | K.W. Muth Company | 🇺🇸 Sheboygan, WI, United States | 2 |
| 4. | K.W. Muth Company, Inc. | 🇺🇸 Sheboygan, WI, United States | 10 |
| 5. | KWM GUTTERMAN INC. | 🇺🇸 Rockdale, IL, United States | 1 |