PCB Piezotronics, Enclosure, models:

IMI SENSORS 682A00	Installation And Operating Manual
IMI SENSORS 682A00/06	Installation And Operating Manual
IMI SENSORS 684a16	Installation And Operating Manual
IMI SENSORS 691A50/02	Installation And Operating Manual
IMI SENSORS 691A50/04	Installation And Operating Manual
IMI SENSORS 691A50/08	Installation And Operating Manual
IMI SENSORS 691A50/12	Installation And Operating Manual