Volvo excavators: In 1991 the venerable (Started in 1939) Åkerman company became part of Volvo, in 1997 the machines was introduced with Volvo stickers and color. 1998 Volvo bought out Samsung's excavator production and the next year Volvo branded machines were being built in Korea. Volvo made their way into the compact excavator business by buying french manufacturer Pel-Job in 1995, introducing Volvo branded machines in the year 2000.
Wheel loaders: An orignal Volvo product (The first machine is from 1954) in 1985 Volvo and Clark-Michigan merged. Michigan's smaller machines were phased out (Instead Volvos with Michigan stickers were sold on the North American market) and Volvo put their paint on Michigans bigger machines. I belive this lasted until the early 90'is when Volvo bought out their partner. With the Volvo 350F replacing the 330 last year most if not all of Michigans influence on Volvo's wheel loader design are gone I would say. Zettelmayer was bought in 1991 to help Volvo take market shares in the compact wheel loader segment of the market. Parca, Samsung and Pel-Job are other brands that Volvo aquired but their wheel loader lines are today dead.
Skid steers: Volvo bought Scat trak in 2001
Backhoe loaders: Volvos own design. Introduced on the market in 2002. It is worth nothing that Volvo produced "backhoes" earlier. Bigger (And many according to the scandinvians better!) ones but they were discontinued in the late 90is due to the small market. Their EL70c a articulated 10-13 ton machine are missed. Their current line of backhoes arent really even imported to Sweden ... A Swedish Volvo salesmen could prolly not sell one of those "toys" to save his life!
Articulated haulers: Original Volvo (Or atleast Swedish product) springs from Bolinder-Munktell / Livab which started producation of machines in 1955 that have evolved in the todays articulated haulers.
Graders: Have "always" been a Volvo (Or atleast Swedish) product under different brand names. Cannot find the years but for some years (In the 90is?) there wasnt any Volvo graders until Champion was bought in 1997 and Volvo painted Champions showed up in 2001.
Road machinery: In 2007 Volvo bought and repainted Ingersoll Rand's pavers and compactors.
Rigid Haulers: Euclid and Kockums have ended up under the Volvo umbrella but no Volvo rigid haulers have been made since the early 90is. Maybe time for a comeback soon?
Dozers: Never have been any ... Maybe in the future?!
Volvo have a great history site online at Volvo:
http://www.volvo.com/constructionequipment/global/en-gb/AboutUs/history/products/introduction.htm