![]() Microwave Development Laboratories Microwave Development Laboratories (MDL) is a producer of waveguide components and subassemblies. | ![]() CS Holdings CS Holdings (CS홀딩스 주식회사, formerly known as Chosun Welding) is a company that manufactures and markets welding materials. | Sierra Circuits Sierra Circuits (also known as Sierra Proto Express) is a company that manufactures and assembles printed circuit boards. | |
Founding Date | Founding Date 1948 | Founding Date 1949 | Founding Date 1986 |
Type | Type Private | Type Public | Type Private |
Tags | |||
Locations | Locations Needham Heights, US HQ | Locations Pohang, KR HQ Seoul, KR | Locations Sunnyvale, US HQ Delta, CA |
Employees | Employees 21 | Employees 325% decrease | Employees 478 |
Financial | |||
Revenue (est.) | Revenue (est.) N/A | Revenue (est.) ₩134.9b (FY, 2025) | Revenue (est.) $108m (Y, 2024) |
Operating ⚠ | |||
Certifications and Compliance | Certifications and Compliance 2 (Jul, 2024) | Certifications and Compliance N/A | Certifications and Compliance 10 (Jun, 2024) |
Tools | Tools 3 (Jul, 2024) | Tools N/A | Tools 16 (Jun, 2024) |

CS Holdings (CS홀딩스 주식회사, formerly known as Chosun Welding) is a company that manufactures and markets welding materials.
View companySierra Circuits (also known as Sierra Proto Express) is a company that manufactures and assembles printed circuit boards.
View company