| 505-Series | Crystal Controlled Oscillators (XCO) |
| 512-Series | Crystal Controlled Oscillators (XCO) |
| 522-Series | Crystal Controlled Oscillators (XCO) |
| 524DD | Crystal Controlled Oscillators (XCO) |
| 531-Series | Crystal Controlled Oscillators (XCO) |
| 533BD | Crystal Controlled Oscillators (XCO) |
| 535-Series | Crystal Controlled Oscillators (XCO) |
| 555-Series | Crystal Controlled Oscillators (XCO) |