# Relationship history for MSHA mine 1202033

Current hierarchy: **Schulties C W → Indiana Coal Company → Buck Creek**

- 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:** Ronald E  Laswell et al → Buck Creek; 1985-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Laswell Coal Company Inc → Buck Creek; 1988-08-01 to 1991-07-07; source msha-controller-operator-history
- **controller_controls_operator:** Ronald E  Laswell et al → Laswell Coal Company Inc; 1988-08-01 to 1991-07-07; source msha-controller-operator-history
- **operator_operates_mine:** Indiana Coal Company → Buck Creek; 1991-07-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Schulties C W → Buck Creek; 1991-07-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Schulties C W → Indiana Coal Company; 1991-07-08 to current/open; source msha-controller-operator-history