![An early radio telephone, type PTC 116, made by Pye, Cambridge. This is the type of radio telephone that the police would have used from the 1950s onw... - SuperStock An early radio telephone, type PTC 116, made by Pye, Cambridge. This is the type of radio telephone that the police would have used from the 1950s onw... - SuperStock](https://cdn.superstock.com/1895/Comp/1895-19532.webp)
An early radio telephone, type PTC 116, made by Pye, Cambridge. This is the type of radio telephone that the police would have used from the 1950s onw... - SuperStock
![Establishment of radio-iodine refractory PTC cell lines. (A). MTT tests... | Download Scientific Diagram Establishment of radio-iodine refractory PTC cell lines. (A). MTT tests... | Download Scientific Diagram](https://www.researchgate.net/publication/366088441/figure/fig1/AS:11431281105517205@1670432817488/Establishment-of-radio-iodine-refractory-PTC-cell-lines-A-MTT-tests-suggested-BCPAP.png)
Establishment of radio-iodine refractory PTC cell lines. (A). MTT tests... | Download Scientific Diagram
![PTC in Operation Across Over 98 Percent of Required Class I Route Miles - Association of American Railroads PTC in Operation Across Over 98 Percent of Required Class I Route Miles - Association of American Railroads](https://www.aar.org/wp-content/uploads/2020/01/PTC-Infographic.jpg)