In the court case, it was also cited that the design for winged toasters was not original and that the Berkeley Systems' design was itself derived from the Jefferson Airplane album "Thirty Seconds Over Winterland", which also used flying toasters adorned with wings. Berkeley argued that the firm was unaware of the previous artwork until 1991, and that the album cover's toasters had clocks in addition to their wings. Jefferson Airplane later sued Berkeley Systems in turn for the use of the same flying toaster emblem. The rock group lost the case as they did not trademark the album cover at the time of publication.