Echo ranging and listening gear
United States Patent 2460316

Inventors:
Trent, Horace M.
Jones, Thomas F.
Publication Date:
02/01/1949
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Assignee:
Trent, Horace M.
Jones, Thomas F.
Primary Class:
Other Classes:
367/901, 367/137, 340/566
US Patent References:
2131993Sonic depth and height indicator
2235385Welding method and apparatus
2284850Speed indicating apparatus
2329570Device for regulating the sensitivity of signal receiving apparatus
Foreign References:
AU118392B
GB180646A