Starting in 1855 I. Porro began developing instruments for photogrammetry.
Ignazio Silone | Ignazio Visco | Ignazio Giunti | Ignazio Gardella | Ignazio Ciufolini | Girolamo Porro, ''Antique map of Iceland'', from the National and University Library of Iceland | Sant'Ignazio | porro | Paolo Ignazio Maria Thaon di Revel | Ignazio Porro | Ignazio Marino | Ignazio Licata | Ignazio Danti | Ignazio Collino | Ignazio Abate | Count Ignazio Alessandro Cozio di Salabue |