# Relationship history for MSHA mine 0405453

Current hierarchy: **Charles J  Coffyn → Brownstone Quarry → Brownstone Quarry**

- 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:** Brownstone Quarry → Brownstone Quarry; 2000-08-01 to 2003-01-27; source msha-controller-operator-history
- **controller_controls_mine:** Charles J  Coffyn → Brownstone Quarry; 2000-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Charles J  Coffyn → Brownstone Quarry; 2000-08-01 to 2003-01-27; source msha-controller-operator-history
- **operator_operates_mine:** W W Rock Inc. → Brownstone Quarry; 2003-01-28 to 2005-05-15; source msha-controller-operator-history
- **controller_controls_mine:** Sean S  Weaver → Brownstone Quarry; 2003-01-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sean S  Weaver → W W Rock Inc.; 2003-01-28 to 2005-05-15; source msha-controller-operator-history
- **operator_operates_mine:** Brownstone Quarry → Brownstone Quarry; 2005-05-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Charles J  Coffyn → Brownstone Quarry; 2005-05-16 to current/open; source msha-controller-operator-history