# Relationship history for MSHA mine 2301458

Current hierarchy: **Riverstone Group → Central Stone Company → Taylor Plant #39**

- 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:** Riverstone Group → Taylor Plant #39; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Monte L Christner Company → Taylor Plant #39; 1950-01-01 to 1979-04-09; source msha-controller-operator-history
- **controller_controls_mine:** Christner Monte L → Taylor Plant #39; 1950-01-01 to 1979-04-09; source msha-controller-operator-history
- **controller_controls_operator:** Christner Monte L → Monte L Christner Company; 1950-01-01 to 1979-04-09; source msha-controller-operator-history
- **operator_operates_mine:** Central Stone Company → Taylor Plant #39; 1979-04-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Riverstone Group → Central Stone Company; 1979-04-10 to current/open; source msha-controller-operator-history