# Relationship history for MSHA mine 0102443

Current hierarchy: **Douglas Terry R → Prospect Mining Company → Day Mine**

- 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

- **operator_operates_mine:** Fondren Minerals Inc → Day Mine; 1982-03-01 to 1985-06-10; source msha-controller-operator-history
- **controller_controls_mine:** Fondren Charles D → Day Mine; 1982-03-01 to 1985-06-10; source msha-controller-operator-history
- **controller_controls_operator:** Fondren Charles D → Fondren Minerals Inc; 1982-03-01 to 1985-06-10; source msha-controller-operator-history
- **operator_operates_mine:** Prospect Mining Company → Day Mine; 1985-06-11 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Douglas Terry R → Day Mine; 1985-06-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Douglas Terry R → Prospect Mining Company; 1985-06-11 to current/open; source msha-controller-operator-history