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Effective Surveillance Area
abbr., astronaut., mil.	ESA

Effective: 210 phrases in 47 subjects

Accounting	4
Agriculture	2
Analytical chemistry	11
Antennas and waveguides	10
Banking	2
Building structures	1
Chemistry	3
Communications	6
Construction	24
Economy	6
Electric motors	2
Electric traction	2
Electronics	11
Energy industry	1
Finances	16
General	13
Health care	3
Human rights activism	1
Immigration and citizenship	3
Labor law	1
Law	12
Lighting other than cinema	2
Magnetics	13
Mathematics	7
Medical	2
Microsoft	2
Natural sciences	1
Nuclear physics	3
Obsolete / dated	2
Oil / petroleum	1
Patents	1
Piezoelectric crystals	4
Power lines	2
Radio	3
Radiology	8
Satellite communications	2
Security systems	1
Semiconductors	2
Soil science	2
Sound recording	3
Superconductivity	1
Telecommunications	2
Telegraphy	4
Telephony	1
Thermal engineering	1
Transport	4
Welding	2