# Relationship history for MSHA mine 1508010

Current hierarchy: **Greene Sherman → Pond Creek Coal Company → No 3 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Moore Larry A → No 3 Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Greene Sherman → No 3 Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Big Wood Coal Co → No 3 Mine; 1975-01-01 to 1975-07-13; source msha-controller-operator-history
- **controller_controls_operator:** Moore Larry A → Big Wood Coal Co; 1975-01-01 to 1975-07-13; source msha-controller-operator-history
- **operator_operates_mine:** Pond Creek Coal Company → No 3 Mine; 1975-07-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Greene Sherman → Pond Creek Coal Company; 1975-07-14 to current/open; source msha-controller-operator-history