![]() CS Holdings CS Holdings (CS홀딩스 주식회사, formerly known as Chosun Welding) is a company that manufactures and markets welding materials. | ![]() Calumet Electronics Calumet Electronics is a company that designs and manufactures printed circuit boards (PCBs). | Sierra Circuits Sierra Circuits (also known as Sierra Proto Express) is a company that manufactures and assembles printed circuit boards. | |
Founding Date | Founding Date 1949 | Founding Date 1968 | Founding Date 1986 |
Type | Type Public | Type Private | Type Private |
Tags | |||
Locations | Locations Pohang, KR HQ Seoul, KR | Locations Calumet, US HQ | Locations Sunnyvale, US HQ Delta, CA |
Employees | Employees 325% decrease | Employees 1186% increase | Employees 478 |
Financial | |||
Revenue (est.) | Revenue (est.) ₩134.9b (FY, 2025) | Revenue (est.) N/A | Revenue (est.) $108m (Y, 2024) |

Calumet Electronics is a company that designs and manufactures printed circuit boards (PCBs).
View companySierra Circuits (also known as Sierra Proto Express) is a company that manufactures and assembles printed circuit boards.
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