21. Heron of Alexandria invented a basic steam engine and demonstrated knowledge of mechanic and pneumatic systems . 22. Pneumatic systems incorporate a hand pump to pressurize the interior of the mast causing it to rise.23. Pneumatic system failure, associated loss of altitude, and various unfamiliar situations may cause loss of situational awareness.24. As atmospheric icing occurs and ice builds up, a pneumatic system inflates the boot with compressed air. 25. The transaction also includes Halkey-Roberts Corp ., a manufacturer of valves and pneumatic systems for disposable medical applications. 26. A pneumatic system was proposed by proponents of Edison's direct current as the basis of the power grid. 27. However, I think it would be a bad idea to use hydrogen for any sort of pneumatic system . 28. It uses an pneumatic system to capture each dose and deliver it to its either stocked or dispensed location. 29. Only when actually about to fire, would the large hydro-pneumatic system raise the 5-tonne barrel up over the parapet. 30. Mk III and IV carriages incorporated a new variable-recoil hydro-pneumatic system and moved from above to below the gun barrel.
