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| Number | Title | Issue Date |
| 5970795 | Apparatus and method for testing attenuation of in-use insert hearing protectors The system is designed for the purpose of providing a means of conducting objective assessment of the actual or "real world" attenuation which is provided by insert-type hearing protection (IHP) devices. A device is constructed to serve as the input devic... | 10/26/1999 |
| 5757930 | Apparatus and method for testing attenuation of in-use insert hearing protectors The device of the present invention is designed for the purpose of providing a system for conducting objective assessment of the actual or "real world" attenuation which is provided by insert-type hearing protection (IHP) devices. The device is constructe... | 05/26/1998 |
