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main ring stresses
gen.	крепёжная рама (WiseSnake); рама крепления (WiseSnake)
astr.	среднее кольцо; кольцо В

main ring: 53 phrases in 24 subjects

Astronautics	3
Aviation	1
Caspian	4
Computer networks	1
Construction	6
Electronics	1
Firefighting and fire-control systems	1
Gas processing plants	2
General	1
Karachaganak	2
Makarov	1
Mass media	1
Military	1
Mining	1
Molikpaq	3
Nautical	2
Oil / petroleum	5
Oil and gas	2
Oil and gas technology	2
Oilfields	2
Technology	4
Tengiz	3
Thermal engineering	3
Wind Energy	1