protection in cases of partial unemployment to home workers, while an ordinance of August 1970 fixed the conditions of health necessary for service in the merchant navy. A general provision of October 1970 determined in detail the circumstances in which the competent authority must take action on the basis of the act on the technical means of work. The requirement also stipulated the extent to which the technical standards established by national and international organisations can be regarded as "rules of the art". In a directive of 10 November 1970, the Minister of Labour and Social Affairs recommended to the higher authorities for work protection of the "Lander" to bring in the directive published, in agreement with the Ministry of Labour, by the German Engineers' Association on the evaluation of work station noise in relation to loss of hearing, in order to improve safeguards for workers against the noises in question. In September 1971, an ordinance was published concerning dangerous working materials; safeguarding persons using these materials against the dangers involved. In August 1971, a law came into force directed at reducing atmospheric pollution from lead compounds in four-stroke engine fuels. As a safeguard against radiation, a decree on the system of authorisations for medicaments treated with ionizing radiation or containing radioactive substances, in its version of 8 August 1967, was remodelled by a new Decree of 10 May 1971 which added some radionuclides to the list of medicaments which doctors in private practice were authorized to use. By a decree of the Federal Minister for Labour and Social Order, the Federal Institute for Industrial Protection became the Federal Agency for Industrial Protection and Accident Research. Amongst its designated tasks included the promotion of industrial protection, accident prevention on the journey to and from work and accident prevention in the home and leisure activities, the encouragement of training and advanced training in the area of industrial protection, and to promote and coordinate accident research. A regulation was issued in 1972 which permitted for the first time the employment of women as drivers of trams, omnibuses and lorries, while further regulations laid down new provisions for lifts and work with compressed air. The Factory Constitution Law (1971) strengthened the rights of individual employees "to be informed and to be heard on matters concerning their place of work". The Works Council was provided with greater authority while trade unions were given the