# Relationship history for MSHA mine 0102536

Current hierarchy: **Powell Joe E → Pickens Coal Inc → Oakman Mine #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

- **operator_operates_mine:** Tommy Stimpson Excavating Inc → Oakman Mine #2; 1983-04-01 to 1985-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Stimpson James T (Tommy) → Oakman Mine #2; 1983-04-01 to 1991-06-09; source msha-controller-operator-history
- **controller_controls_operator:** Stimpson James T (Tommy) → Tommy Stimpson Excavating Inc; 1983-04-01 to 1985-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Powell Joe E → Oakman Mine #2; 1983-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Pickens Coal Inc → Oakman Mine #2; 1986-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Powell Joe E → Pickens Coal Inc; 1986-01-01 to current/open; source msha-controller-operator-history