# Relationship history for MSHA mine 4300381

Current hierarchy: **John A  Russell Jr → John A. Russell Corporation → Crushed Rock Inc.**

- 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:** Milo L  Pike → Crushed Rock Inc.; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Crushed Rock Inc → Crushed Rock Inc.; 1984-12-01 to 1986-06-30; source msha-controller-operator-history
- **controller_controls_mine:** John  Swenor → Crushed Rock Inc.; 1984-12-01 to 1986-06-30; source msha-controller-operator-history
- **controller_controls_operator:** John  Swenor → Crushed Rock Inc; 1984-12-01 to 1986-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Pike Industries Inc → Crushed Rock Inc.; 1986-07-01 to 1988-06-01; source msha-controller-operator-history
- **controller_controls_operator:** Milo L  Pike → Pike Industries Inc; 1986-07-01 to 1988-06-01; source msha-controller-operator-history
- **operator_operates_mine:** Pike Industries Inc → Crushed Rock Inc.; 1988-06-02 to 1996-09-30; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Crushed Rock Inc.; 1988-06-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Pike Industries Inc; 1988-06-02 to 1996-09-30; source msha-controller-operator-history
- **operator_operates_mine:** John A. Russell Corporation → Crushed Rock Inc.; 1996-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John A  Russell Jr → Crushed Rock Inc.; 1996-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John A  Russell Jr → John A. Russell Corporation; 1996-10-01 to current/open; source msha-controller-operator-history