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optical reference point
commun., transp.	punto de referencia visual

optical : 293 phrases in 38 subjects

Antennas and waveguides	36
Automated equipment	1
Aviation	1
Chemistry	32
Cinematography	4
Communications	8
Data processing	5
Earth sciences	10
Electronics	26
General	9
Health care	3
Immigration and citizenship	1
Industry	6
Information technology	14
Lasers	1
Lighting other than cinema	5
Measuring instruments	8
Medical	2
Meteorology	4
Microsoft	3
Military	3
Natural sciences	3
Obsolete / dated	2
Ophthalmology	1
Patents	53
Photography	1
Physical sciences	1
Physics	1
Piezoelectric crystals	1
Politics	2
Radio	2
Remote sensing	5
Technology	21
Textile industry	10
Thermal Energy	1
Transport	3
United Nations	1
Video recording	3