# Relationship history for MSHA mine 0402695

Current hierarchy: **Terra Industries Inc → El Rancho Rock & Sand Inc → El Rancho Rock & Sand Incorporated**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Linden Sand & Gravel Inc → El Rancho Rock & Sand Incorporated; 1950-01-01 to 1986-10-23; source msha-controller-operator-history
- **controller_controls_mine:** Kovack James → El Rancho Rock & Sand Incorporated; 1950-01-01 to 1986-10-23; source msha-controller-operator-history
- **controller_controls_operator:** Kovack James → Linden Sand & Gravel Inc; 1950-01-01 to 1986-10-23; source msha-controller-operator-history
- **operator_operates_mine:** Linden Aggregates Inc → El Rancho Rock & Sand Incorporated; 1986-10-24 to 1989-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Steen Cosby E → El Rancho Rock & Sand Incorporated; 1986-10-24 to 1989-09-30; source msha-controller-operator-history
- **controller_controls_operator:** Steen Cosby E → Linden Aggregates Inc; 1986-10-24 to 1989-09-30; source msha-controller-operator-history
- **operator_operates_mine:** El Rancho Rock & Sand Inc → El Rancho Rock & Sand Incorporated; 1989-10-01 to 1990-10-17; source msha-controller-operator-history
- **controller_controls_mine:** Busch Melvin L → El Rancho Rock & Sand Incorporated; 1989-10-01 to 1990-10-17; source msha-controller-operator-history
- **controller_controls_operator:** Busch Melvin L → El Rancho Rock & Sand Inc; 1989-10-01 to 1990-10-17; source msha-controller-operator-history
- **operator_operates_mine:** El Rancho Rock & Sand Inc → El Rancho Rock & Sand Incorporated; 1990-10-18 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Terra Industries Inc → El Rancho Rock & Sand Incorporated; 1990-10-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Terra Industries Inc → El Rancho Rock & Sand Inc; 1990-10-18 to current/open; source msha-controller-operator-history