# Relationship history for MSHA mine 1513242

Current hierarchy: **Dawson R R Sr → R R Dawson Bridge Company → Mine No 265**

- 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

- **controller_controls_mine:** Dawson R R Sr Et Al → Mine No 265; 1974-08-05 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** R R Dawson Bridge Company → Mine No 265; 1981-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dawson R R Sr Et Al → R R Dawson Bridge Company; 1981-11-01 to current/open; source msha-controller-operator-history