Operating signal within 12 months from two or more independent sources.
What they make
Radio and Television Broadcasting and Wireless Communications Equipment Manufacturing334220- timing
- frequency solutions
- NTP servers
- PC cards
- amplifiers
- digital clocks
- in-house engineering
- Automation
- Aerospace
- Defense
- customer support accessible 365
NAMED ON THE COMPANY’S OWN WEBSITE, READ JUL 29, 2026
Where it is
Other plants nearby
| Facility | City | Industry | Status | Distance |
|---|---|---|---|---|
| Masterclock, Inc. | St. Charles | Radio and Television Broadcasting and Wireless Communications Equipment Manufacturing 334220 | LIKELY ACTIVE | 0.0 KM |
| Commercial Electronics | Earth City | Telephone Apparatus Manufacturing 334210 | LIKELY ACTIVE | 4.0 KM |
| Cashion Fire Equipment, LLC | Bridgeton | Heavy Duty Truck Manufacturing 336120 | ACTIVE | 9.3 KM |
| Potter Electric Signal Company - St. Louis | Hazelwood | Other Communications Equipment Manufacturing 334290 | LIKELY ACTIVE | 9.0 KM |
| Sump Alarm, INC | Saint Louis | Other Measuring and Controlling Device Manufacturing 334519 | ACTIVE | 11.3 KM |
Also at this address
No other federal record shares this street address.
Where this record comes from
3 sources hold this plant, and 9 fields on this page come from them. Each line is one agency’s own record of it: the identifier it is filed under, whether that record shows the plant operating or only that it exists, and when the register first and last saw it there.
- The company’s own websiteOPERATINGfirst seen JUL 2026 · last seen OCT 2026
- SAM.gov entity registrationOPERATINGRecord SXT8K5HELZE8 · first seen FEB 2026 · last seen SEP 2026
- OSHA injury and illness reportsOPERATINGRecord 1285155 · first seen DEC 2025 · last seen DEC 2025
IN ST. CHARLES COUNTY1 other plant shares this one’s industry (Communications Equipment Manufacturing, NAICS 3342); 1 of them has a size band on record.
What each source says
Every field below, as each source filed it. The value this page shows is marked; where the sources disagree, the field says so. Status is computed from independent sources; nothing here is self-reported unless marked Claimed.
- Name
- SAM.gov: MASTERCLOCK, INC. · SEP 2026
- Street address
- SAM.gov: 2484 W CLAY ST · SEP 2026
- City
- SAM.gov: SAINT CHARLES · SEP 2026
- State
- SAM.gov: MO · SEP 2026
- Coordinates
- Census geocoder: 38.784181548717,-90.512676667129 · JUL 2026
- Employees (band)
- OSHA: 20-99 · DEC 2025
- Website
- SAM.gov: http://www.masterclock.com · SEP 2026
- CAGE code
- SAM.gov: 1GZF9 · SEP 2026
- SAM registration expires
- SAM.gov: 2027-09-03 · SEP 2026