| K974242 | ARGOSY PROGRAMMABLE ONQUE | January 20, 1998 |
| K971699 | ARGOSY DYNAMEQ | July 3, 1997 |
| K961729 | ARGOSY PROGRAMMABLE | May 29, 1996 |
| K954038 | K-AMP 16, HI-BAND K-AMP, ULTRA COMPRESSION & HEARING PROTECTION/HEARING INSTRUMENT | September 18, 1995 |
| K952451 | CLASS D LINEAR WITH ACTIVE TONE CONTROL | July 6, 1995 |
| K952452 | OUTPUT COMPRESSION LIMITER WITH ACTIVE TONE CONTROL | July 6, 1995 |
| K952450 | WIDE DYNAMIC RANGE COMPRESSION WITH ACTIVE TONE CONTROL | July 6, 1995 |
| K952454 | EXPANDER WITH ACTIVE TONE CONTROL | June 21, 1995 |
| K952453 | INPUT COMPRSSION LIMITER WITH ACTIVE TONE CONTROL | June 21, 1995 |
| K952455 | IMPROVED MANHATTAN II | June 21, 1995 |
| K944078 | PROGRAM 3-CH SER HEAR AIDS W/PROGRAM FIT SYST/PRO FIT | October 21, 1994 |
| K944077 | PROGRAM 3-CH SERIES HEAR AIDS W/DT-1 DESKTOP PROGRAM | October 12, 1994 |
| K940116 | COMPLETELY IN THE CANAL | May 3, 1994 |
| K934452 | HI BAND | October 13, 1993 |
| K934454 | MANHATTAN II | October 8, 1993 |
| K934443 | 2:1 INPUT COMPRESSION | October 8, 1993 |
| K934449 | 3-CHANNEL K-AMP | October 8, 1993 |
| K934444 | K-AMP | October 8, 1993 |
| K934447 | LINEAR PLUS-POWER | October 8, 1993 |
| K934446 | POWER MANHATTAN II | October 8, 1993 |