Question: What is Country of Origin, when Type is Disposable, when Primary Cartridge is 105mm, and when Year of Intro is less than 2008?
SQL: SELECT "Country of origin" FROM "2-1618600-4" WHERE "Type" = 'Disposable' AND "Primary cartridge" = '105mm' AND "Year of intro" < 2008.0;

Question: What is Country of Origin, when Year of Intro is 1977?
SQL: SELECT "Country of origin" FROM "2-1618600-4" WHERE "Year of intro" = 1977.0;

Question: What is Country of Origin, when Year of Intro is greater than 1985, and when Primary Cartridge is 125mm?
SQL: SELECT "Country of origin" FROM "2-1618600-4" WHERE "Year of intro" > 1985.0 AND "Primary cartridge" = '125mm';

Question: What is the total number of Year of Intro(s), when Country of Origin is soviet union, when Type is reusable, when Primary Cartridge is 40mm, and when Name/ Designation is rpg-29?
SQL: SELECT COUNT("Year of intro") FROM "2-1618600-4" WHERE "Country of origin" = 'soviet union' AND "Type" = 'reusable' AND "Primary cartridge" = '40mm' AND "Name/ designation" = 'rpg-29';