From Wikipedia: Gremlin Industries was an arcade game manufacturer active from the 1970s to early 1980s, and based San Diego, California, USA.
Gremlin was founded in 1973 as a manufacturer of coin-operated wall games. Gremlin's first wall game, Play Ball, was fairly successful. Gremlin joined the video game market in 1977 by releasing its first video arcade game entitled Blockade. Some of Gremlin's output, were titles originally created by Japanese companies. Among theses video games were Namco's Gee Bee and Konami's Frogger.
In 1979, Gremlin merged its operations with Sega and, from then on, all new video games by Gremlin were labelled either under the Gremlin/Sega or Sega/Gremlin brand names.
Source: Wikipedia, "Gremlin Industries," available under the CC-BY-SA License.