| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 12 | |
| #2 | Canada | 1 |
| # | Industry | |
|---|---|---|
| #1 | Audio-visual technology | |
| #2 | Control | |
| #3 | Machines | |
| #4 | Machine tools | |
| #5 | Mechanical elements |
| # | Technology | |
|---|---|---|
| #1 | Special information storage | |
| #2 | Loudspeakers and microphones | |
| #3 | Teaching materials | |
| #4 | Unspecified technologies | |
| #5 | Unspecified technologies | |
| #6 | Nails | |
| #7 | Metal-working |
| # | Name | Total Patents |
|---|---|---|
| #1 | Hutter William H | 13 |
| Publication | Filing date | Title |
|---|---|---|
| US2452304A | Phonograph needle | |
| US2557350A | Phonograph needle | |
| US2543497A | Phonograph needle | |
| US2476414A | Phonograph pickup having plastic torsion arm | |
| US2473374A | Phonograph needle | |
| US2451221A | Wedged needle type phonograph pickup | |
| US2405307A | Phonograph needle | |
| US2352101A | Pilot trainer | |
| US2409938A | Pilot trainer | |
| US2230865A | Pickup arm | |
| US2236599A | Pickup arm | |
| US1912454A | Acoustic apparatus | |
| CA459384A | Phonograph needle |