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effective area
rem.sens.	مساحة نافعة
total effective area of an antenna for a given direction
antenn.	المساحة الفعالة الكلية للهوائي وباتجاه محدد
effective area of a search coil
magn.	ملف بحث

effective area : 4 phrases in 3 subjects

Antennas and waveguides	1
Satellite communications	1
Semiconductors	2