Hans Laube invented a system for synchronizing these things as a gimmick for a project by Mike Todd, Jr. in the 1960s.  
Cyrano Sciences sells a device for digitizing these things.  Hans Laube invented a system for synchronizing these things as a gimmick for a project by Mike Todd, Jr. in the 1960s.  Amy Radcliffe made a prototype called the Madeleine which uses headspace technology to record these things.  Before founding Times Square's Roxy Theater, Samuel Rothafel used these things to make a 1909 newsreel of the Rose Bowl more exciting.  One system for (*) dispersing these things debuted with the unpopular Behind the Great Wall.  Cards were used to deliver these things in John Waters' film, Polyester.  These things were released through the air-conditioning system in a film whose "vision" system propagated these things.  For 10 points, name these things which could be released by scratching certain paper cards, triggering one of your senses.
Cyrano Sciences sells a device for digitizing these things.  
smells [or scents; or aromas; or smell-o-vision] 