# Relationship history for MSHA mine 0504792

Current hierarchy: **Burnco Rock Products Ltd → BURNCO → WARRIOR POWERSCREEN 2100  0504792**

- 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:** George W  Hall et al → WARRIOR POWERSCREEN 2100  0504792; 2003-07-08 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Hall-Irwin Corporation → WARRIOR POWERSCREEN 2100  0504792; 2004-06-01 to 2012-09-01; source msha-controller-operator-history
- **controller_controls_operator:** George W  Hall et al → Hall-Irwin Corporation; 2004-06-01 to 2012-09-01; source msha-controller-operator-history
- **controller_controls_mine:** Scott  Masi et al → WARRIOR POWERSCREEN 2100  0504792; 2009-02-13 to 2017-02-26; source msha-controller-operator-history
- **operator_operates_mine:** BURNCO → WARRIOR POWERSCREEN 2100  0504792; 2012-09-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Scott  Masi et al → BURNCO; 2012-09-02 to 2017-02-26; source msha-controller-operator-history
- **controller_controls_operator:** Bret  Hall et al → BURNCO; 2012-09-02 to 2017-02-26; source msha-controller-operator-history
- **controller_controls_mine:** Burnco Rock Products Ltd → WARRIOR POWERSCREEN 2100  0504792; 2017-02-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Burnco Rock Products Ltd → BURNCO; 2017-02-27 to current/open; source msha-controller-operator-history