30:55 · This is the Mantuan cross. The version here shown is the Eisernes Kreuz, the Iron Cross, a German Order medal. The order was inaugurated by King Friedrich Wilhelm III of Prussia in the year 1813, and intended to unite and encourage his people in their fight against Napoleon's French armies.
    This cross is used by the German navy. During the First World War it appeared as a battle sign on the sides of German tanks, fighter aircraft, etc.
    It has also been used as a fascist symbol, for example, in France.
    One reader of this work sent the following additional information by e-mail: "Five centuries ago the Knights Order of the Temple (symbol: Cross of Malta) was outlawed by the Pope. But in Portugal they remained quite powerful (their Master Knight at the time being Prince Henry of Portugal). In Portugal they just renamed it the Order of Christ (symbol: Cross of Christ without the external circle). The members of the order were so powerful and rich that they actually payed the Portuguese discoveries. That's why the discoverers' ships used that symbol on their sails. Also I want to add that the Crutch Cross is a simplified draw of the Cross of Christ. It was used centuries ago, for instance carved in milestones placed on roads close to the ports by Portuguese ship crews. It was a `quick signature' of the Kingdom of Portugal".