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concave optical tool
industr., construct., met.	Hohlschale f; konkave Schale

concave: 169 phrases in 28 subjects

Agriculture	10
Antennas and waveguides	1
Archaeology	1
Astronomy	5
Automobiles	1
Business	1
Chemistry	3
Construction	13
Earth sciences	1
Gear train	1
General	10
Industry	9
Information technology	1
Life sciences	2
Mathematics	1
Medical	3
Medical appliances	6
Metallurgy	6
Mining	4
Natural resourses and wildlife conservation	2
Operations research	2
Optics branch of physics	32
Packaging	2
Paleontology	1
Physical sciences	3
Physics	14
Technology	32
Transport	2