The Gem City Engineering CO.
Doing business as Libra Industries
At a glance
EmployeesNot reported
In business sinceNot reported
HeadquartersDayton, OH
US patents5
SAM.gov UEIXDFDP26VTM68
CAGE code53147
Incorporated inOH
LEI254900RRMVFV4FFIRP71
Brands
Libra-slide-deliver-lg
Libra-slide-intention-lg
Libra-slide-perform-lg
Libra-slide-solve-lg
Libra-slide-adapt-lg
Libra-slide-built-care-lgThis company sells these brands.
- cleanroom assembly
- mechatronics assembly
- metal fabrication
- PCBA
- powder coating
- precision machining
- systems integration
- defense
- aerospace
- medical device
- robotics
Named on the company’s own website, read JUL 29, 2026
CareersCareers page — seen SEP 8, 2026
Supplier designations
For Profit OrganizationManufacturer of Goods
Self-certified by the company in its SAM.gov registration
Patents
5 US patents granted 1993–2003, none of them in the five years to SEP 2025.
Machine tools 4Transport 1
- Process of manufacturing a core metal insertUS 6,532,787 · granted MAR 18, 2003
- Process of manufacturing a core metal insertUS 6,447,928 · granted SEP 10, 2002
- Expanded metal strip for reinforcing a resilient productUS 5,783,312 · granted JUL 21, 1998
- Expanded metal strip for reinforcing a resilient productUS 5,302,466 · granted APR 12, 1994
- Production of expanded metal strip for reinforcing a resilient productUS 5,199,142 · granted APR 6, 1993
Granted to The Gem City Engineering Co. · PatentsView (USPTO), data through SEP 30, 2025 · CC BY 4.0
Their plant
| Facility | City | State | Employees | Status |
|---|---|---|---|---|
| The Gem City Engineering CO. | Dayton | OH | — | ACTIVE |
Compiled from federal records — EPA, OSHA, SAM.gov and the U.S. Census — and from the company’s own website. Federal source data is public domain. Each plant’s page names the source of every field.