Answer: A chronology that determines the age of a feature or event in years.
Explanation:
Mass production of printed material. Before the press, each page of a Bible, for example, could take all day to write. After the press it would take a few days to carve the stamp, but then you could print 50 copies of the page in a very short time.
The answer is economic recovery package of aid from the United States to western europe after WWII.
Vertical lines using steel frames
