# Relationship history for MSHA mine 4701744

Current hierarchy: **Reimer Ralph & Dale Dawson → R & T Quality Stone Company → Lannon Quarry**

- 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:** R & T Quality Stone Company → Lannon Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Reimer Ralph & Dale Dawson → Lannon Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Reimer Ralph & Dale Dawson → R & T Quality Stone Company; 1950-01-01 to current/open; source msha-controller-operator-history