# Relationship history for MSHA mine 2200748

Current hierarchy: **Thomas G  Comer  Jr → Limestone Red Bay, Inc. → Columbus Mine**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Bulldog Sand and Gravel → Columbus Mine; 2003-04-16 to 2013-04-17; source msha-controller-operator-history
- **controller_controls_mine:** Thomas G  Comer  Jr → Columbus Mine; 2003-04-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thomas G  Comer  Jr → Bulldog Sand and Gravel; 2003-04-16 to 2013-04-17; source msha-controller-operator-history
- **controller_controls_mine:** Thomas G  Comer  Jr → Columbus Mine; 2011-03-30 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Limestone Red Bay, Inc. → Columbus Mine; 2013-04-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thomas G  Comer  Jr → Limestone Red Bay, Inc.; 2013-04-18 to current/open; source msha-controller-operator-history