Matches in Library of Congress for { ?s ?p Digital telephone systems.. }
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- 00265342 subject "Digital telephone systems.".
- 2001018887 subject "Digital telephone systems.".
- 2002034282 subject "Digital telephone systems.".
- 2002071368 subject "Digital telephone systems.".
- 2002510249 subject "Digital telephone systems.".
- 2005936930 subject "Digital telephone systems.".
- 2009367303 subject "Digital telephone systems.".
- 81011633%2F%2Fr84 subject "Digital telephone systems.".
- 83021698 subject "Digital telephone systems.".
- 84145209 subject "Digital telephone systems.".
- 90037906 subject "Digital telephone systems.".
- 90124588 subject "Digital telephone systems.".
- 92223319%2F%2Fr98 subject "Digital telephone systems.".
- 94029054 subject "Digital telephone systems.".
- 97046553 subject "Digital telephone systems.".
- 97048368 subject "Digital telephone systems.".
- 98006456 subject "Digital telephone systems.".
- 98047586 subject "Digital telephone systems.".
- 99031620 subject "Digital telephone systems.".
- 99034015 subject "Digital telephone systems.".