# Relationship history for MSHA mine 0402775

Current hierarchy: **Sean  Pyorre; Melvin  Pyorre; Patricia  Pyorre → Big River Rock Co → 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Watkins Sand & Gravel → Big River Rock Co; 1950-01-01 to 2003-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Robert M  Watkins → Big River Rock Co; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert M  Watkins → Watkins Sand & Gravel; 1950-01-01 to 2003-06-30; 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
- **operator_operates_mine:** Big River Rock Co → Big River Rock Co; 2003-07-01 to 2009-06-29; source msha-controller-operator-history
- **controller_controls_operator:** Patricia  Pyorre  et al → Big River Rock Co; 2003-07-01 to 2009-06-29; source msha-controller-operator-history
- **controller_controls_operator:** Melvin  Pyorre  et al → Big River Rock Co; 2003-07-01 to 2009-06-29; source msha-controller-operator-history
- **operator_operates_mine:** Big River Rock Co → Big River Rock Co; 2009-06-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Melvin  Pyorre et al → Big River Rock Co; 2009-06-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Melvin  Pyorre et al → Big River Rock Co; 2009-06-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Patricia  Pyorre et al → Big River Rock Co; 2009-06-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sean  Pyorre et al → Big River Rock Co; 2009-06-30 to current/open; source msha-controller-operator-history