You didn’t add a picture showing the statements
The clause is really a state's rights clause. A state may not pass a law that makes something illegal that was legal before the law was passed. In other words if a state suddenly passed a law that said it is no longer legal to park your car in front of any government building, but it was legal to do so yesterday, the police cannot come to your door and issue a ticket for parking in front of a government building because you did it yesterday.
The constitution actually uses the phrase ex post facto law in Article 1 Section 10 Clause 1.
La historia de todas las sociedades humanas habidas hasta hoy ha sido la historia de la lucha de clases. Hombre libre y esclavo, patricio y plebeyo, barón y siervo de la gleba, maestro y oficial del gremio, en una palabra, opresores y oprimidos se enfrentaron en perpetuo antagonismo, librando una lucha incesante, a veces encubierta y a veces franca, lucha que se saldó en cada caso con una transformación revolucionaria de toda la sociedad o bien con el hundimiento conjunto de las clases enfrentadas.
No. even if the equipment is similar you have to have specific training and Welding you have to use specific equipment and it can be dangerous if you don't know the guidelines
