# Relationship history for MSHA mine 4608111

Current hierarchy: **Thomas J  Lockhart → 16 Tons Coal Company Inc → No 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

- **controller_controls_mine:** Wilcher Geoffrey S → No 2; 1990-04-01 to 1993-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Coal Power Corp → No 2; 1991-10-01 to 1993-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Wilcher Geoffrey S → Coal Power Corp; 1991-10-01 to 1993-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Thomas J  Lockhart → No 2; 1992-11-12 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** 16 Tons Coal Company Inc → No 2; 1993-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thomas J  Lockhart → 16 Tons Coal Company Inc; 1993-07-01 to current/open; source msha-controller-operator-history