Dixon ZTR - Serial Numbers & Models history guide -
4426 Model 91174-92848. 3303/3304 Models 60676-64506. 4423 Model 92849-95342. 6025 Model 02409-02633. 7025 Model 0200-02454. 6025 Model 2634-2780. 7025 Model 2455-4999. 5022 Model 2556-4023 4515B ...