# Relationship history for MSHA mine 2400663

Current hierarchy: **James W  Weaver → Big Horn Calcium Company → Red Rock 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

- **controller_controls_mine:** James W  Weaver et al → Red Rock Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Albert A  Schellinger → Red Rock Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Eucon Corporation → Red Rock Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** De Atley Company Inc → Red Rock Quarry; 1979-01-01 to 1985-06-17; source msha-controller-operator-history
- **controller_controls_operator:** Eucon Corporation → De Atley Company Inc; 1979-01-01 to 1985-06-17; source msha-controller-operator-history
- **operator_operates_mine:** Schellinger Construction Company Inc → Red Rock Quarry; 1985-06-18 to 1988-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Albert A  Schellinger → Schellinger Construction Company Inc; 1985-06-18 to 1988-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Big Horn Calcium Company → Red Rock Quarry; 1988-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James W  Weaver et al → Big Horn Calcium Company; 1988-07-01 to current/open; source msha-controller-operator-history