4. Geometrical instruments
  5. Straightedge type
  6. Plural straightedges, relatively moveable

Samuel J. Raff

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Computational aid device for Ekelund ranging

Geometrical instruments – Straightedge type – Plural straightedges – relatively moveable
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Method of detecting the presence of an enemy submarine

Communications: electrical – Selective – Monitoring in addition to control
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Profile ID: LFUS-PAI-P-1066142

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