Rexophone crystal set with two pairs of Telefunken headphones (out of three), 1923-1930 Radio Communication 1923-1930
Great Western Railway steam locomotive 'King George V' 4-6-0 King class, No 6000, 1927 Locomotives and Rolling Stock 1927
Experimental television receiver used by JL Baird in demonstration, made 1925-1926 Radio Communication 1925-1926
Rubin’s apparatus for uterotubal insufflation, New York, United States, 1928 Obstetrics, Gynaecology & Contraception 1928
Plastic collapsing camera for 120 rollfilm 2 1/4 x 3 1/4 inches. Fitted with a simple lens of fixed aperture. T/I shutter. Reflecting rotating finder. Rajar No 6 camera Photographic Technology 1929