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M+, Hong Kong. Gift of Twemco Industries Ltd., 2019, © Twemco Industries Ltd.
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Tai Wah Electrical Mfg. Co. (now Twemco Industries Ltd.) 大華電器製造廠（現為大驊晶工實業有限公司）
Patent letter, from the commissioner of Patents, USA 美國專利委員簽發的專利證書
11 November 1969
Written, 'a request for the grant of a patent has been made by Lau, Chun Leung and Lau, Chi Leung, both Chinese and both of 24 Pine Street, 1st Floor, Tai Kok Tsui, Kowloon in the Colony of Hong Kong for the sole use and advantage of an invention for calendar clock mechanism.'
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