# Relationship history for MSHA mine 1302070

Current hierarchy: **Manaco Corporation → Wendling Quarries, Inc. → PORTABLE CRUSHING DEPT 437**

- 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:** David L  Coots → PORTABLE CRUSHING DEPT 437; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Coots Materials Company Inc → PORTABLE CRUSHING DEPT 437; 1985-07-01 to 2019-06-02; source msha-controller-operator-history
- **controller_controls_operator:** David L  Coots → Coots Materials Company Inc; 1985-07-01 to 2019-06-02; source msha-controller-operator-history
- **controller_controls_mine:** Manaco Corporation → PORTABLE CRUSHING DEPT 437; 1987-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Wendling Quarries, Inc. → PORTABLE CRUSHING DEPT 437; 2019-06-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Manaco Corporation → Wendling Quarries, Inc.; 2019-06-03 to current/open; source msha-controller-operator-history