![](https://coimages.sciencemuseumgroup.org.uk/449/855/large_thumbnail_smg00240989.jpg)
![](https://coimages.sciencemuseumgroup.org.uk/449/855/large_thumbnail_smg00240989.jpg)
![](https://coimages.sciencemuseumgroup.org.uk/449/853/large_thumbnail_smg00240987.jpg)
Six germanium surface barrier transistors
![](https://coimages.sciencemuseumgroup.org.uk/449/851/large_thumbnail_smg00240985.jpg)
Four germanium point-contact transistors
![](https://coimages.sciencemuseumgroup.org.uk/449/852/large_thumbnail_smg00240986.jpg)
Thirty germanium junction transistors
![](https://coimages.sciencemuseumgroup.org.uk/479/522/large_thumbnail_smg00249560.jpg)
Transistors
![](https://coimages.sciencemuseumgroup.org.uk/449/865/large_thumbnail_smg00240999.jpg)
Five silicon mesa transistors
![](https://coimages.sciencemuseumgroup.org.uk/449/866/large_thumbnail_smg00241000.jpg)
Silicon planar transistors of various make
![](https://coimages.sciencemuseumgroup.org.uk/449/48/large_thumbnail_smg00240533.jpg)
Seven silicon power transistors
![](https://coimages.sciencemuseumgroup.org.uk/449/878/large_thumbnail_smg00241013.jpg)
Philco T1925 transistors
![](https://coimages.sciencemuseumgroup.org.uk/479/528/large_thumbnail_smg00249566.jpg)
Transistors
![](https://coimages.sciencemuseumgroup.org.uk/479/525/large_thumbnail_smg00249563.jpg)
Transistors
![](https://coimages.sciencemuseumgroup.org.uk/479/516/large_thumbnail_smg00249554.jpg)
Transistors
![](https://coimages.sciencemuseumgroup.org.uk/479/523/large_thumbnail_smg00249561.jpg)
Darling Transistors
![](https://coimages.sciencemuseumgroup.org.uk/448/977/large_thumbnail_smg00239808.jpg)
GET 3 transistor
circa 1950
![](https://coimages.sciencemuseumgroup.org.uk/475/687/large_thumbnail_smg00244385.jpg)
Transistors
![](https://coimages.sciencemuseumgroup.org.uk/475/681/large_thumbnail_smg00244379.jpg)
Transistors
![](https://coimages.sciencemuseumgroup.org.uk/476/108/large_thumbnail_smg00244967.jpg)