The broken line disclosures shown in the Figures of the acoustic feedback learning aid design are for illustrative purposes only and forms no part of the claimed design.
The broken line disclosures shown in the Figures of the acoustic feedback learning aid design are for illustrative purposes only and forms no part of the claimed design.
Number | Name | Date | Kind |
---|---|---|---|
D261669 | Tran et al. | Nov 1981 | S |
D287145 | Shilton et al. | Dec 1986 | S |
D318306 | Cheung | Jul 1991 | S |
D406867 | Wise et al. | Mar 1999 | S |
D410046 | Fletcher | May 1999 | S |
D420404 | Yiu | Feb 2000 | S |
D420405 | Plain et al. | Feb 2000 | S |
D453793 | Hou | Feb 2002 | S |
D473203 | Enos et al. | Apr 2003 | S |