# Relationship history for MSHA mine 0402181

Current hierarchy: **Gardner Larry → Gardner'S Rock Company → Gardners Rock**

- 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:** Rays Rock Sand & Gravel Company → Gardners Rock; 1950-01-01 to 1979-10-14; source msha-controller-operator-history
- **controller_controls_mine:** Ray George H → Gardners Rock; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ray George H → Rays Rock Sand & Gravel Company; 1950-01-01 to 1979-10-14; source msha-controller-operator-history
- **operator_operates_mine:** Gardner'S Rock Company → Gardners Rock; 1979-10-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Gardner Larry → Gardners Rock; 1979-10-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gardner Larry → Gardner'S Rock Company; 1979-10-15 to current/open; source msha-controller-operator-history