at the Musée des Blindés at Saumur. Projects and variants AMR 33 TSF In 1934, the three command vehicles of the 4e GAM and 18e dragons of 4e DC were rebuilt as AMR 33 TSF (Télégraphie Sans Fil or "wireless") by fitting them with an ER29 radio set, the antenna of which was placed on the left back corner of the hull. It is unknown whether any other command tanks were so modified. Modernisation Already in 1934 it became obvious that Renault had been right in advising to select a different suspension type. The standard one proved to be much too flimsy and especially the oil shock dampers were very maintenance intensive. Both the three vehicles built in 1935 and the two rebuilt prototypes were therefore fitted with an improved AMR 35 suspension type with rubber cylinders. Prototype 79758 had been used to test three different systems: the first with the trailer wheel touching the ground, the second with five road wheels and the last was the one selected. The second type would form the basis for the Renault ZB, a lengthened export version, destined for China. It was more lightly armoured at 9 mm and had a 65 hp engine. Twelve were ordered in 1938, six with a 13,2 mm machine gun and six with a 37 mm cannon. After continuing reports regarding the unreliability of the matériel – often ascribed to the fact that not professional drivers but half-trained conscripts were the most frequent users – it was decided to investigate whether structural changes had to be made. Accordingly, the type was again tested by the Commission de Vincennes between 8 September 1936 and 5 May 1937. The commission concluded on 17 February 1938 that the suspension was fundamentally unsuited for cross-country driving and advised that all existing vehicles be fitted with a new system. When war broke out, it was decided to improve readiness by fully revising all AMR 33s. During that process they were to be refitted with the new suspension. About half a dozen vehicles had been so modified on 10 May. Type M Late in 1932 – this is known by a later confirming letter dated 18 December 1932 – Renault had a meeting with General Weygand, during which he proposed to develop an entire family of light armoured fighting vehicles based on the AMR 33-chassis. He was especially interested in producing a Voiture