Mathematics
1892-1900
Example (no.6173) of the "Rapid Computer" patented in 1892 by the Baker-Vawter Co., Benton Harbor, Michigan, USA, in case, with instruction leaflet and stylus
Domestic Appliances
1965; 1965
home-built amplifier constructed from a kit produced by the Heathkit Company; built by Bernard Manning in Littleborough in about 1965
