# Relationship history for MSHA mine 2402226

Current hierarchy: **Brad  Mercord → Montana Rockworks Inc. → MCGREGOR**

- 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:** Bill  Carter et al → MCGREGOR; 2001-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Montana Rockworks Llp → MCGREGOR; 2001-09-01 to 2007-09-13; source msha-controller-operator-history
- **controller_controls_operator:** Bill  Carter et al → Montana Rockworks Llp; 2001-09-01 to 2007-09-13; source msha-controller-operator-history
- **controller_controls_operator:** Brad  Mercord et al → Montana Rockworks Llp; 2001-09-01 to 2007-09-13; source msha-controller-operator-history
- **operator_operates_mine:** Montana Rockworks Inc. → MCGREGOR; 2007-09-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bill  Carter et al → MCGREGOR; 2007-09-14 to 2023-01-06; source msha-controller-operator-history
- **controller_controls_operator:** Bill  Carter et al → Montana Rockworks Inc.; 2007-09-14 to 2023-01-06; source msha-controller-operator-history
- **controller_controls_operator:** Brad  Mercord et al → Montana Rockworks Inc.; 2007-09-14 to 2023-01-06; source msha-controller-operator-history
- **controller_controls_mine:** Brad  Mercord → MCGREGOR; 2023-01-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brad  Mercord → Montana Rockworks Inc.; 2023-01-07 to current/open; source msha-controller-operator-history