742545 semiconductor manufactured by Sylvania, listed as 742545 (circa 1979).

742544 semiconductor manufactured by Sylvania, listed as 742544 (circa 1979).

742537 semiconductor manufactured by Sylvania, listed as 742537 (circa 1979).

742513 semiconductor manufactured by Sylvania, listed as 742513 (circa 1979).

742512 semiconductor manufactured by Sylvania, listed as 742512 (circa 1979).

742510 semiconductor manufactured by Sylvania, listed as 742510 (circa 1979).

742366 semiconductor manufactured by Sylvania, listed as 742366 (circa 1979).

742365 semiconductor manufactured by Sylvania, listed as 742365 (circa 1979).

742364 semiconductor manufactured by Sylvania, listed as 742364 (circa 1979).

742363 semiconductor manufactured by Sylvania, listed as 742363 (circa 1979).

742362 semiconductor manufactured by Sylvania, listed as 742362 (circa 1979).

742349 semiconductor manufactured by Sylvania, listed as 742349 (circa 1979).

742348 semiconductor manufactured by Sylvania, listed as 742348 (circa 1979).

742009 semiconductor manufactured by Sylvania, listed as 742009 (circa 1979).

742008 semiconductor manufactured by Sylvania, listed as 742008 (circa 1979).

742004 semiconductor manufactured by Sylvania, listed as 742004 (circa 1979).

741931 semiconductor manufactured by Sylvania, listed as 741931 (circa 1979).

741870 semiconductor manufactured by Sylvania, listed as 741870 (circa 1979).

741869 semiconductor manufactured by Sylvania, listed as 741869 (circa 1979).

741868 semiconductor manufactured by Sylvania, listed as 741868 (circa 1979).