solid brass mail slot

mail slot   Dan mail slot cover interior

Can someone please show me what the mailslot in the hp 18 autoloader is used for?

Mail-slot definition: A slot in a wall or door through which mail is delivered  P Riopel Inc , manufacturer of mail boxes and distributor of the highest quality Canada Post approved mailboxes

mega burning wins_ 27 ways slot The Mailslot mechanism allows for short message broadcasts to all listening computers across a given network domain Features  i'm install MSL6030 i'm seen user guide manual but not understand mail slot i have 5 LTO tape slot is empty and 0~4 slot is tape