obj
    spawner
        var
            spawn_type=/mob/monster/Bleh //Define the type path that you wish to spawn
            spawn_max=1 //Only produce 1 every 600 ticks
            spawn_time=600 //600 ticks equals one minute
            list
                spawned=list() //Gotta keep track of our babies!
        proc
            Spawn()
                while(src.spawned.Remove(null))
                spawn(src.spawn_time)
                    if(src.spawn_max<src.spawned.len)
                        var/mob/monster/M=new src.spawn_type(src.loc)
                        M.owner=src
                        src.spawned.Add(M)

mob
    monster
        var
            obj
                spawner
                    owner
        Del()
            ..()
            src.owner.Spawn() //Call the owners Spawn() to make the same monster respawn in a given time