# Relationship history for MSHA mine 3100625

Current hierarchy: **Darden Thomas F → Cherokee Sanford Group Inc → NORWOOD PIT**

- 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:** Stanly Shale Products → NORWOOD PIT; 1950-01-01 to 1991-01-22; source msha-controller-operator-history
- **controller_controls_mine:** Justin Industries Inc → NORWOOD PIT; 1950-01-01 to 1991-01-22; source msha-controller-operator-history
- **controller_controls_operator:** Justin Industries Inc → Stanly Shale Products; 1950-01-01 to 1991-01-22; source msha-controller-operator-history
- **controller_controls_mine:** Darden Thomas F → NORWOOD PIT; 1988-11-08 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Cherokee Sanford Group Inc → NORWOOD PIT; 1991-01-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Darden Thomas F → Cherokee Sanford Group Inc; 1991-01-23 to current/open; source msha-controller-operator-history