AXIS
http://www.axiscom.co.jp/prod/prtsrv/
BUFFALO
http://buffalo.melcoinc.co.jp/products/catalog/network/printserver.html
corega
http://www.corega.co.jp/product/list/others/index.htm
ELECOM
http://www2.elecom.co.jp/network/print-server/
hp
http://h50146.www5.hp.com/products/printers/jetdirect/
I-O DATA
http://www.iodata.jp/prod/network/fileserver/index.htm#print
Logitec
http://www.logitec.co.jp/products/lan.html
PLANEX
http://www.planex.co.jp/product/print/
silex technology
http://www.silex.jp/japan/products/network/printserver/