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After more than 30 years' rapid growth since the foundation in 1990, CASTECH INC. has become a recognized leading supplier of crystals, optics and laser components in the world. In 2008 CASTECH successfully completed IPO in Shenzhen stock exchange. (Stock Code 002222) Today, at our 450,000 sq ft advanced facility, over 1000 employees are dedicating to satisfy customer needs in terms of performance and cost effectiveness.
Crystals for Laser and Telecom Application:
With more than thirty years' untiring effort, CASTECH has developed flux, Czochralski, water solution and Bridgman-Stockbarger crystal growing technology, now is a worldwide leading supplier with largest mass production lines in the world for LBO, BBO, Nd:YVO4 and KTP. In addition, we also provide CLBO, BiBO, KDP, KD*P, Yb:CALGO, Yb:KGW, Ti: Sapphire, TGG, TSAG, α-BBO and other crystals for laser and telecom industries.

Zhejiang Crystal Optoelectronic Technology Co., Ltd. (COT) was founded on August 2, 2002 and listed on the Shenzhen Stock Exchange on September 19, 2008 (stock code 002273). In 2022, total revenue reached 43.76 billion yuan, with year-on-year growth of 14.86%, and the net profit climbed up to 5.95 billion yuan.
Over the past twenty years, COT has been a global optical expert in the field of information transaction, providing one-stop professional services from core components up to modules and solutions. At present, the company is involved in R&D and manufacturing process in five major industrial sectors, and its products include Optic Components, Thin-film Optics, Semiconductor Optics, Automotive Electronics & AR+, Reflective Materials, etc. The company has more than ten wholly-owned and controlling subsidiaries, and participates in multiple enterprises such as Japan Guangchi Co., Ltd., Ningbo Jishi Investment, Wuhan Wuyi Yuntong, Jingbang Optics, and Zhaoge Digital.
Our products span from Consumer Electronics, to Automotive Electronics and Metaverse. For Consumer Electronics, products such as Infra-Red Cut Filter (IRCF), Camera Cover Glass (CG), Narrow Band Pass Filter (NBPF) help COT to rank among the world's top producers and sellers. Our core competitiveness lies in its leading global technology integration ability to combine "Thin Film Design, Micro Nano Optic Techonology, Optic Cold Forming, and large-scale Automation" together. For Automotive Electronics, Head Up Display (HUD), Car Cams, and LiDAR window glasses have all been applied to the products and services of globally renowned vehicle manufacturers. For Metaverse, AI and display technology have developed rapidly in past few years, and COT has laid out a full technology path in the AR field to help incubate technology giants in mass production. In addition, the reflective materials produced by Zhejiang Yeshili, a wholly-owned subsidiary of Crystal Optech, have maintained a leading technological position in China for many years.
Looking into the future, with diversified application of Optics across different fields, the global optical industry has ushered in a golden opportunity. Crystal Optech will adhere to the guiding principle of "globalization, technology-oriented, and open cooperation", uphold the business philosophy of "be noble in life, be excellent in work", shoulder the mission of "innovation makes optics stronger, optics makes the world a better", and strive to "become an outstanding one-stop optical expert in the world"!

Since 1932 Hans & Jos. Kronenberg GmbH have produced high-quality components for the lift and machinery industry. With our demand to combine quality and design we have become a very successful partner of the international lift industry. We count among the leading European manufacturers of door interlocks, switches and lift operating panels.

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AFRISO於1869年由Adelbert Fritz在Schmiedefeld/Turingia創建，是一家創新的中型家族企業，在全球擁有1000多名員工，其中550多名員工在我們的四個德國工廠。傳統上，我們生產溫度和壓力的測量和控製裝置。50多年來，我們也一直在製造用於環境保護的測量、控製和監測設備。
今天，AFRISO是加熱和儲罐係統安全領域的領導者之一，也是壓力、溫度和液位測量技術領域的工業合作夥伴。“智慧首頁”等潮流話題與我們也有一個傳統：我們從1997年就開始處理“樓宇內事件報道”的話題。自2012年以來，最新的智能首頁一代得到了進一步的可持續發展，為您的首頁的建築安全、提高居住舒適性或改善室內氣候提供了令人信服的傳感器和執行器。

hopf Elektronik GmbH is one of the oldest manufacturer of radio controlled clocks being synchronized by the DCF77 transmitter and one of the leading companies in Europe. The company was founded in 1972 and produces both conventional and satellite radio controlled clocks for industrial purposes. Our products have gained an outstanding reputation in many countries.
The company hopf is specialized in hard- and software alteration in order to realize specific customer’s requirements referring to special ranges of application. Our team of experienced experts and technicians advises you at any time. It is our philosophy to reach our customer’s confidence by efficiency and flexibility. Our production line is not only characterized by high quality standards but includes also services such as new developments, technical advices and training courses which are offered in the English language, too.
Our products are developed by our own engineers and are manufactured by using the newest technical equipment. Furthermore, the merchandise is tested for its functionality based on the required quality standards.
We want to have satisfied customers. That is the reason why the high quality of our products and our services is one of our uppermost company objectives.
Due to the high precision and reliability of the hopf radio controlled clocks our customers belong to the sectors of space technology, aviation, navigation, modern communication technology and energy supply. The industrial sector refers is covered by technology of measurement and registering of business operating data.

Rudolf Kiesewetter以他的名字命名了萊比錫的Excelsior工廠Rudolf Kiesewetter，他於1908年在德國建立了第一家測量儀器廠。1942年，工廠被摧毀，但在戰爭結束後，經過巨大而不懈的努力，工廠得以重建。
Kiesewetter先生於1958年去世。同年，該公司成為半國有企業。在前民主德國，Kiesewetter發展成為一係列測量技術產品的唯一製造商。主要產品包括開關麵板儀表和曝光儀表。另一個重點是監測、轉換和記錄電量和物理量的設備。
隨著德國的統一，Rudolf Kiesewetter Messtechnik GmbH獲得了新生
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努力工作、毅力、鋼鐵般的意誌和不斷的遠見與遠見相結合，產生了最高質量的產品。
Rudolf Kiesewetter Messtechnik GmbH及其產品在國內和國際上享有盛譽
。
我們宣稱的目標是為您，客戶，提供創新的產品，同時不斷努力擴大產品範圍，提供最新的技術。