Block · one region of the page, as the scanner read it. It may hold a whole story, part of one, several, or an advertisement; stitching blocks into articles is the next step. Text is supplied OCR.
Page 3 · column 4 of 5 · from the scan, no model involved

Seiberling Carbojet Top Quality Rubber Applied to Fully Inspected A-l Casings
650-13 $^\50 750-14 only e*chg. 670-15 * Plus tax 800-14 850-14 710-15 760-15 50 exchg. plus tax
80.8%