The World Book Encyclopedia, Tom 4Field Enterprises Educational Corporation, 1960 |
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Strona 136
... ships at sea and pro- viding antiaircraft protection . The destroyer escort is a smaller ship developed during World War II primarily for slower speed convoy duties . These 1,300 - ton to 1,500 - ton ships are armed primarily with ...
... ships at sea and pro- viding antiaircraft protection . The destroyer escort is a smaller ship developed during World War II primarily for slower speed convoy duties . These 1,300 - ton to 1,500 - ton ships are armed primarily with ...
Strona 179
... ship . Most direction finders on ships and planes have been replaced by more accurate devices ( see AIRCRAFT IN- STRUMENTS ; ANTENNA ; RADAR [ Ships ] ; LORAN ) . Govern- ment agencies use direction finders to locate illegal radio ...
... ship . Most direction finders on ships and planes have been replaced by more accurate devices ( see AIRCRAFT IN- STRUMENTS ; ANTENNA ; RADAR [ Ships ] ; LORAN ) . Govern- ment agencies use direction finders to locate illegal radio ...
Strona 203
... ships . They help build underwater foun- dations for bridges and piers . Sometimes , divers recover great treasures of gold and silver and other valuable cargoes from the holds of sunken ships . A diver faces danger each time he goes ...
... ships . They help build underwater foun- dations for bridges and piers . Sometimes , divers recover great treasures of gold and silver and other valuable cargoes from the holds of sunken ships . A diver faces danger each time he goes ...
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