| Binary system |
| Warning device |
| PC linkup system |
| Alkaline ecosystems |
| Lifting device? |
| Heating devices. |
| Aerosol devices |
| Analog delay device |
| ___ system (blood classification) |
| Buy now, pay later" system |
| Medieval dungeon device |
| Feature of Melvil Dewey's book classification system |
| Diagnostic lab system |
| Musician's device also called a sordino |
| System with dots and dashes |
| Copy protection device, to tech geeks |
| Catchphrase of a contraceptive device's mascot? |
| Aircraft's aiming device |
| Clearing device? |
| Airline with missile defense systems |
| Electrical device |
| Defective device |
| Jack-in-the-box device? |
| Acoustic device |
| Device controlling inflow into a cistern |
| Paris underground system |
| System of fixed attention, contemplation, concentration. |
| Aircraft-detection system |
| Shorthand system introduced in 1888 |
| Devices that record data on noisy dogs? |