found: Cook, R. The Slingerland book, c1996:t.p. (Slingerland) p. 22, etc. (Singerland Banjo & Drum Co.) p. 31 (Slingerland Drum and Banjo Company) p. 94 (photo of main factory (1928-1959): Slingerland Drums) p. 132 (facsim. of 1941 advertisement: Singerland Drum Co.) p. 116 (acquired by Fred Gretsch Enterprises in 1986) p. 157 (acquired by Gibson in 1994)
found: OCLC database, Aug. 26, 2002(hdg.: Slingerland Drum Company; usage: Slingerland Banjo & Drum Co. [reprint of 1928 publ.]; variant: Slingerland Drum Co.)
found: Gibson WWW site, URL: http://www.gibson.com/products/slingerland/1999/Story.html, Aug. 23, 2002(the Slingerland Company [no publs. in OCLC] was founded in 1912; name changed to Slingerland Banjo and Drum Company in 1928; acquired by Gibson Guitar Corp. in 1994)
found: Grovemusic WWW site, Aug. 26, 2002(Slingerland; firm of percussion instrument makers; established 1921 in Chicago as Slingerland Banjo and Drum Co.; discontinued its banjos and became Slingerland Drum Co. sometime before 1941; became part of C.G. Conn group in 1970; in 1984 the Slingerland and Deagen firms were purchased by Larry and Sandra Rasp, becoming the Sanlar Corporation, which went out of business a year later; Slingerland name and product line sold first to Fred Gretsch Enterprises, then, in 1994, to Gibson Musical Instruments, who established Slingerland as a subsidiary)