Atlantic-City Convention Center: particolare delle placchette (le placchette dei registri ad altissima pressione (2500 mm !) hanno una tacca rossa; quelle dei registri a 1250 mm. hanno una tacca verde) (Foto Jean-Louis Coignet)

Atlantic-City Convention Center: détail des dominos (les jeux parlant à très haute pression (2500 mm !) ont une petite incrustation rouge; ceux parlant à 1250 mm. ont une petite incrustation verte) (Photo Jean-Louis Coignet)

Atlantic-City Convention Center: detail of some stop-touches (touches of high-pressure stops (2500 mm !) have a small red bullett; those of 1250 mm. pressure stops have a green bullett) (Photo Jean-Louis Coignet)