by a laurel wreath and frequently topped by the Portuguese royal crown (representing the royal tutelage of the misericórdias since their foundation). After the implantation of the republic, some misericórdias opted by less "monarchic" achievement, eliminating the royal crown and instead placing the two shields in courtesy over the armillary sphere of the present Portuguese coat of arms. Besides this, many variations occur, like the representation of the arms of the misericórdia and of Portugal in the same shield parti per pale, or the replacement of the arms of Portugal by those of the local municipality. In the early 1930s, the heraldist Afonso Dornelas of the Section of Heraldry of the Association of Portuguese Archeologists proposed a model for the heraldry to be bore by the misericórdias, but this not implemented by most of them. In the 1990s, the heraldist J. Bernard Guedes proposed a new heraldic model that has been accepted and implemented by a number of misericórdias. Accordingly, with this model, the achievement of arms is composed of a round-bottom shield, a Marian crown and a scroll with the designation of the institution. The charges included in this model of coat of arms are more heterogeneous than in the old one, although some of them, such as the shrimping net (heraldic badge of Queen Eleanor, founder of the misericórdias), are frequently repeated. Bernard Guedes also established the model for the heraldic flags, which have a white field with a saltire azur (taken from the crest of the family coat of arms of Friar Miguel Contreiras, the mythical creator of the misericórdias), a bordure in the main color of the coat of arms, with the cantons in the main metal charged with the abbreviation "MIZA" in the I and IV and with diverse charges in the II and III. Corporate heraldry Corporate heraldry refers to the coats of arms of the several types of Portuguese corporations, including charitable organizations, labor organizations, educational institutions and others. Corporate heraldry achieved a high development in the scope of the corporative regime of the Estado Novo, in force from 1933 to 1974. Under the Estado Novo, the labor and economic activities of the Nation were to be framed by corporative bodies or corporations (in a broad sense), including the trade unions, the guilds, the orders of independent professionals, the houses of the fishermen and the houses of people. Under the leadership of the