![]() Calumet Electronics Calumet Electronics is a company that designs and manufactures printed circuit boards (PCBs). | ![]() 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 1968 | Founding Date 1948 | Founding Date 1949 | Founding Date 1986 |
Type | Type Private | Type Private | Type Public | Type Private |
Tags | ||||
Locations | Locations Calumet, US HQ | Locations Needham Heights, US HQ | Locations Pohang, KR HQ Seoul, KR | Locations Sunnyvale, US HQ Delta, CA |
Employees | Employees 1186% increase | Employees 21 | Employees 325% decrease | Employees 478 |
Financial | ||||
Revenue (est.) | Revenue (est.) N/A | Revenue (est.) N/A | Revenue (est.) ₩134.9b (FY, 2025) | Revenue (est.) $108m (Y, 2024) |
Operating ⚠ | ||||
Certifications and Compliance | Certifications and Compliance N/A | Certifications and Compliance 2 (Jul, 2024) | Certifications and Compliance N/A | Certifications and Compliance 10 (Jun, 2024) |
Facility Space, sq. ft. | Facility Space, sq. ft. 160 k (May, 2024) | Facility Space, sq. ft. 50 k (Jul, 2024) | Facility Space, sq. ft. N/A | Facility Space, sq. ft. N/A |
Markets | Markets 5 (May, 2024) | Markets 5 (Jul, 2024) | Markets N/A | Markets N/A |
Tools | Tools N/A | Tools 3 (Jul, 2024) | Tools N/A | Tools 16 (Jun, 2024) |

Microwave Development Laboratories (MDL) is a producer of waveguide components and subassemblies.
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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