1960s
Chalk
1960s
Chalk
1970s
Foils
1970s
Foils
1978
Lettraset
1978
Lettraset
1981
TROFF
1981
TROFF
1988
PowerPoint
1988
PowerPoint
1996
Web
1996
Web
Blackboard
Compiling
Techniques
Film
Difference Function
Whiteboard
Lots of
Colours
Overheads
Computer
Graphics
with
Overlays
Overheads
Computer
Graphics
with
Overlays
Overheads
Computer
Graphics
with
Overlays
Overheads