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发明名称
Compression and expansion of range of energy level
摘要
申请公布号
US1875157(A)
申请公布日期
1932.08.30
申请号
US19290374920
申请日期
1929.06.29
申请人
AMERICAN TELEPHONE AND TELEGRAPH COMPANY
发明人
ROBERTS LELAND C.
分类号
H04B1/64
主分类号
H04B1/64
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