PT Journal AU Friedmann, A TI Cinematographic Technology and Patents. Notes for Critical Analysis SO Iluminace PY 2007 BP 61 EP 75 VL 19 IS 4 WP https://iluminace.cz/en/artkey/ilu-200704-0005.php DE technical equipment; technical development; film developing; film copying; patents; analysis; film projectors; editing room equipment; sound equipment; camera; 3D film SN 0862397X AB The article analyses in detail the situation of Italian cinematographic technology, development and inventions from the beginnings of cinema to the end of the 1940s, focusing on the years 1920-1934, while trying to find the causes of this situation. ER