1. I am positive that an equivalent system works for iPhone and iPad devices. 2. There are equivalent systems under other names e . g . passive 3D display. 3. Orbitally equivalent system differ only in the time parametrization. 4. Their behavior is analogous to translational spring-mass oscillators ( see Harmonic oscillator # Equivalent systems ). 5. Using the equivalent system technique, engineers can verify and prove to the business that the system will work. 6. Clifford Cocks, an English mathematician working for the GCHQ, described an equivalent system in an internal document in 1973. 7. Another way, often with the least electronics, is to construct an equivalent system of electronic switches ( usually transistors ). 8. The House system is a feature common to Public schools in India ( based on an equivalent system in England ). 9. Equivalent systems can be used to change large and expensive mechanical, thermal, and fluid systems into a simple, cheaper electrical system.10. Linux and Apple OS X have equivalent system hardware information utilities that more or less provide the same level of system detail.