Wassmer

In 1972 in co-operation with Siren they formed a joint company Consortium Europeén de Réalisation et de Ventes d'Avions (CERVA) to build a metal variant of the WA4/21, itself a variant of the WA-40.

The components for the Cerva CE.43 Guépard were manufactured by Siren at Argenton-sur-Creuse and final assembly, equipment fitting and flight testing was carried out by Wassmer at Issoire.

In a move-away from the traditional woodworking heritage of the company it soon developed the ability to produce plastic or composite construction which led to the WA-50 series of four-seat aircraft.

The company's last aircraft design was the WA-80 Piranha a two-seat trainer which was a scaled-down version of the WA-50.

On 1 February 1978 Issoire Aviation, a company set up by Siren, bought the assets of Wassmer and used the former Issoire factory to build gliders and to continue to support Wassmer products.