Required APPs (iPhone + Android) will show a list of used machines/equipments previously filtered by 2-3 fields. From list page will be possible to enter into a detail page ; in the detail page should be a button with a simple request info form. Origin of the data will be a remote DB or a remote XML file.
A similar example of the required master/detail page is this : http://camporese.it/invendita_eng.asp?tip=1
Other details on request