| 1933 BELL TELEPHONE LABOR INC Signaling Art |
| 1953 BELL TELEPHONE LABOR INC Radar System Art |
| 1930 BELL TELEPHONE LABOR INC Acoustic Art |
| 1933 BELL TELEPHONE LABOR INC Acoustic Art |
| 1930 BELL TELEPHONE LABOR INC Acoustic Horn Art |
| 1934 BELL TELEPHONE LABOR INC Sound Radiator Art |
| 1943 BELL TELEPHONE LABOR INC Signaling Art |
| 1959 BELL TELEPHONE LABOR INC Signaling Art |
| 1967 BELL TELEPHONE LABOR INC Wave Analyzer Art |
| 1948 BELL TELEPHONE LABOR INC Acoustic Art |
| 1942 BELL TELEPHONE LABOR INC Timing Art Print |
| 1963 BELL TELEPHONE LABOR INC Vocoder Art Print |
| 1936 BELL TELEPHONE LABOR INC Signaling Art |
| 1932 BELL TELEPHONE LABOR INC Acoustic Art |
| 1969 BELL TELEPHONE LABOR INC Vowel Detector Art |
| 1935 BELL TELEPHONE LABOR INC Acoustic Art |
| 1939 BELL TELEPHONE LABOR INC Signaling Art |
| 1931 BELL TELEPHONE LABOR INC Sound Radiator Art |
| 1939 BELL TELEPHONE LABOR INC Tone Generator Art |
| 1969 BELL TELEPHONE LABOR INC Vocoder System Art |
| 1949 BELL TELEPHONE LABOR INC Tracking Art |