# Relationship history for MSHA mine 0405272

Current hierarchy: **Patricia  Pyorre; Melvin  Pyorre → Big River Rock Company → BIG RIVER ROCK CO.**

- 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:** Big River Rock Company → BIG RIVER ROCK CO.; 1995-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Patricia  Pyorre  et al → BIG RIVER ROCK CO.; 1995-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Patricia  Pyorre  et al → Big River Rock Company; 1995-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Melvin  Pyorre  et al → Big River Rock Company; 1995-09-01 to current/open; source msha-controller-operator-history