Hazeltine Electronics Corporation. Preliminary instruction book for navy model TCS-6 radio telephone and telegraph transmitting and recieving equipment Hazemeyer's N.V. Hollandsche Signaalapparaten. Schusstafel, 75mm; Vo=750m/s, Geschützfirma: Vickers Hazemeyer's N.V. Hollandsche Signaalapparaten. Project L4/0-L4/1-L4/2-L4/3 vuurleidinginstallatie voor 40 mm of 57 mm geschut Hazemeyer's N.V. Hollandsche Signaalapparaten. Preliminary report of demonstrations of the anti-aircraft fire control equipment, Type signal L 4/3