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English thesaurus
Perforated Initials philately
abbr.	PI (Alex Lilo)

Perforated: 265 phrases in 40 subjects

Agriculture	10
Antennas and waveguides	3
Astronomy	1
Automobiles	3
Building structures	2
Chemistry	9
Coal	5
Communications	1
Construction	52
Cultural studies	4
Earth sciences	3
Footwear	3
General	18
Health care	5
Immigration and citizenship	1
Industry	11
Information technology	3
Law	1
Life sciences	1
Materials science	1
Measuring instruments	1
Mechanic engineering	12
Medical	34
Medical appliances	5
Metallurgy	12
Microelectronics	1
Mining	3
Natural resourses and wildlife conservation	3
Nuclear physics	7
Optics branch of physics	1
Packaging	2
Physics	1
Plastics	1
Refrigeration	1
Technology	32
Telegraphy	1
Textile industry	8
Transport	1
Weapons and gunsmithing	1
Work flow	1