PN: A28K1B-EA (Nkk switches of america inc) PN: A28K1B-EA-RO (Nkk switches of america inc) PN: A28K1P-EA (Nkk switches of america inc) PN: A28K1V-EA (Nkk switches of america inc) PN: A28K1V-EA-RO (Nkk switches of america inc) PN: A28KH (Nkk switches of america inc) PN: A28KH-RO (Nkk switches of america inc) PN: A28KV (Nkk switches of america inc) PN: A28KV-RO (Nkk switches of america inc)