https://www.reuters.com/article/us-huawei-tech-developer/huawei-unveils-new-os-for-use-in-smartphones-other-devices-idUSKCN1UZ0MH >Huawei Technologies [HWT.UL] unveiled on Friday its proprietary operating system for use in smartphones and other devices, as U.S. trade curbs imposed in May threaten to cut the Chinese firm's access to crucial U.S. technologies such as Android.