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echo signal

echo

: 401 phrase in 37 subjects

Acoustics	11
Agriculture	3
Astronomy	12
Automated equipment	8
Aviation	4
Communications	82
Computers	31
Cultural studies	1
Earth sciences	22
Electronics	50
Fish farming pisciculture	1
Fishery fishing industry	6
General	4
Health care	3
Hydraulic engineering	1
Information technology	17
Life sciences	2
Linguistics	3
Measuring instruments	3
Medical	14
Medical appliances	31
Metallurgy	2
Microsoft	1
Mineral products	1
Natural resourses and wildlife conservation	4
Natural sciences	3
Physical sciences	13
Physics	1
Piezoelectric crystals	1
Power lines	5
Radio	3
Remote sensing	2
Technology	29
Telecommunications	4
Telephony	1
Transport	16
United Nations	6

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