# Relationship history for MSHA mine 1507409

Current hierarchy: **Smith E Dennis → Ben Le Coal Corp → Prep Plant No 2**

- 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:** Wells Roger Jr → Prep Plant No 2; 1974-03-01 to 1976-05-01; source msha-controller-operator-history
- **operator_operates_mine:** Plastics Universal Inc → Prep Plant No 2; 1974-03-25 to 1976-05-01; source msha-controller-operator-history
- **controller_controls_operator:** Wells Roger Jr → Plastics Universal Inc; 1974-03-25 to 1976-05-01; source msha-controller-operator-history
- **controller_controls_mine:** Smith E Dennis → Prep Plant No 2; 1975-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Plastics Universal Corp → Prep Plant No 2; 1976-05-02 to 1977-07-10; source msha-controller-operator-history
- **controller_controls_mine:** Adams Resources & Energy Inc → Prep Plant No 2; 1976-05-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Adams Resources & Energy Inc → Plastics Universal Corp; 1976-05-02 to 1977-07-10; source msha-controller-operator-history
- **operator_operates_mine:** Ben Le Coal Corp → Prep Plant No 2; 1977-07-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Smith E Dennis → Ben Le Coal Corp; 1977-07-11 to current/open; source msha-controller-operator-history