1. 12 All together!-and we heaved away smartly, raising the sail in smooth folds like a Venetian blind unfurling.

2. The pins (16, 30) of the hinges that link the traction chain links (21, 40) and the adjusting chain links (23, 41), as well as the swivelling pins (16) of the roller shutter bars (14), are mutually aligned when the roller shutter is not used as a Venetian blind.