Matches in Library of Congress for { <http://lccn.loc.gov/50004044> ?p ?o. }
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- 50004044 contributor B1176013.
- 50004044 created "1949.".
- 50004044 date "1949".
- 50004044 date "1949.".
- 50004044 dateCopyrighted "1949.".
- 50004044 extent "28 p.".
- 50004044 issued "1949".
- 50004044 issued "1949.".
- 50004044 language "eng".
- 50004044 publisher "New York, Newcomen Society of England, American Branch,".
- 50004044 subject "537.53".
- 50004044 subject "Edison effect.".
- 50004044 subject "QC544.V3 D5".
- 50004044 subject "Vacuum-tubes.".
- 50004044 type "text".