# Relationship history for MSHA mine 1513151

Current hierarchy: **Sturgill Leslie → Switch Energy Corp → 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

- **controller_controls_mine:** Sturgill Leslie → Mine #2; 1981-04-20 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Roberts Branch Coal Company Inc → Mine #2; 1981-10-01 to 1982-11-07; source msha-controller-operator-history
- **controller_controls_mine:** Madden Henry F → Mine #2; 1981-10-01 to 1982-11-07; source msha-controller-operator-history
- **controller_controls_operator:** Madden Henry F → Roberts Branch Coal Company Inc; 1981-10-01 to 1982-11-07; source msha-controller-operator-history
- **operator_operates_mine:** Switch Energy Corp → Mine #2; 1982-11-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sturgill Leslie → Switch Energy Corp; 1982-11-08 to current/open; source msha-controller-operator-history