Table 2. Prevalence of selected items of everyday technology in households (Source: Wahl and Mollenkopf, 2003, p. 219).

Kind of technology	Availability for serial production	Widespread household adoption	Availability in 2003
Radio	1890s	1940s	nearly 100%
TV	1920s	1950s	nearly 100%
Refrigerator	1910s	1950s	nearly 100%
Telephone	1870s	1930s	around 95%
Central Heating	1880s	1930s	around 60%
Air conditioning	1940s	1950s	around 70%
Washing machine	1910s	1950s	around 80%
Dishwasher	1920s	1970s	around 40%
Microwave Oven	1960s	1970s	around 40%
Video Cassette Recorder	1960s	1980s	around 50%
Personal computer	1970s	1980s	around 24%