From the USN "Electron" magazine for Electronics Technicians

1947 - Model 31 airborne system
https://www.navy-radio.com/journal/electron/m31-electron-4702.pdf
1948 - Model 28 development
https://www.navy-radio.com/journal/electron/m28-electron-4806.pdf
1948 - Lightweight Model 15
https://www.navy-radio.com/journal/electron/m15-lightweight-electron-4810.pdf

Happy reading!
Nick England K4NYW
www.navy-radio.com