Harbin No.4 Radio Factory; Harbin (Heilongjiang, NE) 哈尔滨无线电四厂:

Hēi​lóng​jiāng​ 黑龍江, trad. 黑龙江 or Hēi​lóng​jiāngshěng​ 黑龍江省 (shěng​ 省 = province):​ The province Heilongjiang (Heilungkiang) is in Northeast China (NE), abbr. 黑. The capital is Harbin 哈尔滨. The Heilongjiang river is forming the border between northeast China and Russia, also called Amur river.
Hā​'ěr​bīn​ 哈尔滨, trad. 哈爾濱 or Hā​'ěr​bīnshì​ 哈尔滨市: Harbin is a subprovincial city (市) and the capital of the Heilongjiang province 黑龍江｜黑龙江 in northeast China.


Brands:
Songhuajing 松花江 (Songhua River).
This is the river in Jilin province, which is flowing 吉林省 through Harbin 哈尔滨, a tributary of Heilongjiang 黑龍江｜黑龙江.

History:
Harbin 哈尔滨新生开关厂 Harbin Xinsheng Kaiguan Factory; Harbin (Heilongjiang, NE) changed the name in 1970 to "Harbin No.4 Radio Factory" 哈尔滨无线电四厂. Harbin 哈尔滨新生开关厂 was the developer of China's first real own transistor radio including parts for a pocket sized radio. That was in 1958 and 1959. In 1960 it was produced by ??? under the brand Songhuajing 松花江 and designation 601.