Figure 1-17. Front View Of O9 Control Head With Trunnion; Figure 1-18. Side View Of O9 Control Head With Trunnion; Figure 1-19. Top View Of O9 Universal Relay Controller With Trunnion (Urc Is An Orderable Accessory); Figure 1-20. Side View Of O9 Universalrelay Controller With Trunnion(Urc Is An Orderable Accessory) - Motorola APX 8500 Installation Manual