体和剧毒化学物质,而最终白炽灯的发明进一步提升了光源的安全性,虽然亮度并未更进一步。 电影放映机 Pfragner, Julius. "An Optician Looks for Work". The Motion Picture: From Magic Lantern to Sound. Great
Lens Examiners (USA) Welcome - NACOR | National Association of Canadian Optician Regulators. www.nacor.ca. [2019-03-08]. (原始内容存档于2019-02-27). Opticians :
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