select
a.id_impresora_inventario,c.impresora,a.inventario,d.color,d.modelo,d.clave,d.cantidad
from impresora_inventario a
inner join impresora_toner b
on(a.id_impresora_inventario=b.id_impresora_inventario)
inner join cat_impresora c on(a.id_impresora=c.id_impresora)
inner join toner_entrada d on(d.id_toner=b.id_toner);