Fasteners of metal for use in relation to the following goods: filters; fasteners of metal for use in relation to the following goods: filter housings; closures of metal for containers; containers and conduits of metal for filtration installations and apparatus; parts and fittings for containers and conduits of metal for filtration installations and apparatus; fixing devices of metal; metallic mountings; fixing plates of metal; retaining [fixing] devices of metal; structural joint connectors ...