# Relationship history for MSHA mine 4002300

Current hierarchy: **Cargo J → Ozone Coal Company → No 1 Surface**

- 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:** Resource Processors Inc → No 1 Surface; 1977-08-01 to 1977-12-08; source msha-controller-operator-history
- **controller_controls_mine:** Peery Bruce → No 1 Surface; 1977-08-01 to 1977-12-08; source msha-controller-operator-history
- **controller_controls_operator:** Peery Bruce → Resource Processors Inc; 1977-08-01 to 1977-12-08; source msha-controller-operator-history
- **operator_operates_mine:** Ozone Coal Company → No 1 Surface; 1977-12-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Cargo J → No 1 Surface; 1977-12-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cargo J → Ozone Coal Company; 1977-12-09 to current/open; source msha-controller-operator-history