Just a little list of knife brand names and trademarks known to be associated with, or manufactured by Boker. (Both in Solingen and USA):

Arbolito - Spanish for "little tree". South American branch. Argentina.

Boker Plus - Boker's current "international" brand. Made in Tiawan and China.

Boker USA - Started in 1899 when H. Boker & Co. purchased the Valley Forge plant. Ended U.S. production in 1983.

Casa Boker - Hardware store founded in 1865 by Robert Boker. Sold knives and hardware improted from USA, Germany and England. Known as "the Sears of Mexico".

Cinch - Current manufacture in Solingen.

Cooper Group - Purchased Boker USA from J. Wiss in 1977. Moved production to Statesboro, GA. Ended US production in 1983.

Cyclops Steel - Purchased by Carl F. Boker in 1916. Sold in 1926. Titusville, PA.

George Schrade - Purchased by Boker in 1956. Closed in 1958

H. Boker & Company - Founded in NY in 1837 by Hermann Boker. Imported cutlery from Germany. Began making knives in the US with the purchase of Valley Forge cutlery in 1899.

H. Dorwal - Knives made by Boker in Solingen, distributed by the Remsheid Bokers for the Canadian market.

Heinrich Boker - Official name of the factory in Solingen. Opened in 1869.

Hen and Rooster - Boker made knives under contract in Solingen for Frost. Recent.

Henry Boker - Brand name associated with the Remsheid Bokers. Mostly sold in Australia. Also used on many hand tools in that country.

J. Wiss & Sons - purchased Boker USA in 1969.

J.A. Henkels - Contracted knives made by Boker Solingen. Dates uncertain (1960 - present ???)

John Newton (Sheffield) - Made by Boker USA, Newark, NJ, circa 1906.

John Primble - knives sold by Belknap. Boker USA made knives sold under the Primble trademark from circa 1940s - early 1980s. Primble knives made by Boker have a star on the pattern number stamped on the tang.

Litton Industries - Owned Boker USA in 1968. Sold to J. Wiss in 1969.

Magnum - Knives made in China.

New Britain - Toolmaking company in Connecticutt. Purchased Boker USA in 1965. Bought by Litton Industries circa 1968.

Olde Stag - trademark patented by Boker in 1975 to identify knives made with "del-bone" (delrin) imitation stag handles.

Radium - Blade etch on some Boker knives from early 1900s. History unknown

Rainbow (Providence, RI) - made by Boker USA circa 1933-1954

Razor Steel - Etched on some Boker USA blades circa 1940-1950

Riverside Cut. Co. NY - Made by Boker USA circa 1918

Tree Brand - The Boker brand, USA and Solingen, as it is sometimes called.

Tree Brand Classic - trademark patented in 1974 - used on knife patterns that have been around for a while...

United Boker - Contract knives made by Boker circa 1984-1994.

Valley Forge - Company purchased by H. Boker & Co. in 1899. Closed original plant in 1921, but continued to manufacture Valley Forge knives alongside Boker USA knives in the Maplewood, NJ plant until the 1950s.

Whitehead & Hoag Co. (Newark, NJ) - Made by Boker USA circa 1900-1959

Wright & Wilhelmy (Omaha, NE) - Made by Boker and Ulster

Got any that I missed?