Has TLG ever produced bricks without the LEGO branding?
The Automatic Binding Bricks were first sold in Denmark in 1949. They were sold both in boxed sets and also loose in special wooden cases at retail stores. During the first year of production, neither the bricks nor the packaging had the LEGO name or logo. Beginning in 1950 the name LEGO was molded into the underside of the bricks, however the original molds without the name were still in use, so "nameless" bricks continued to be sold.

The first boxed sets did not have the LEGO name or logo. 



Beginning in 1952, the boxes were marked LEGO Mursten (Mursten means "bricks"). Beginning in 1953, the Automatic Binding Bricks name was dropped and replaced with LEGO Mursten. The bricks were the same, only the name had changed.



In 1955, LEGO produced some 1:87 scale trucks as promotional items used by Esso dealers in Europe. These trucks were marked with the LEGO name on the underside, but were packaged in boxes that had only Esso branding and no LEGO logo or name.



Many modern LEGO pieces are produced without any LEGO logo or name. These are usually small pieces that have no studs or an interior surface large enough to hold the name or logo. Hollow-stud pieces such as the 1x1 round brick are not marked, for example. Neither are Technic lift arms and beams.