# Relationship history for MSHA mine 1511482

Current hierarchy: **Doug  Hess; Robert  Martin → Ranchero Coal Company → Mine No 3**

- 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:** Maynard William → Mine No 3; 1977-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Golden Homes Inc → Mine No 3; 1978-07-01 to 1979-03-18; source msha-controller-operator-history
- **controller_controls_operator:** Maynard William → Golden Homes Inc; 1978-07-01 to 1979-03-18; source msha-controller-operator-history
- **operator_operates_mine:** Three Way Coal Company → Mine No 3; 1979-03-19 to 1982-04-11; source msha-controller-operator-history
- **controller_controls_mine:** Varney Barry Dale & Garry--Doug Hess → Mine No 3; 1979-03-19 to 1982-04-11; source msha-controller-operator-history
- **controller_controls_operator:** Varney Barry Dale & Garry--Doug Hess → Three Way Coal Company; 1979-03-19 to 1982-04-11; source msha-controller-operator-history
- **controller_controls_mine:** Robert  Martin  et al → Mine No 3; 1981-08-10 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Ranchero Coal Company → Mine No 3; 1982-04-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert  Martin  et al → Ranchero Coal Company; 1982-04-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Doug  Hess et al → Ranchero Coal Company; 1982-04-12 to current/open; source msha-controller-operator-history