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The print advertisement appeared in April 20, 1931 Xiang hai tao sheng (香海濤è²), the inside page of Hua qiao ri bao (è¯åƒ'æ—¥å ±). The ad boasted ‘Outtone Super Power Amplifier for film showing’ in English.
The print advertisement appeared in April 20, 1931 Xiang hai tao sheng (香海濤è²), the inside page of Hua qiao ri bao (è¯åƒ'æ—¥å ±). The ad boasted ‘Outtone Super Power Amplifier for film showing’ in English.