# Relationship history for MSHA mine 0501865

Current hierarchy: **Hendricks Thomas & Jennifer Nowak → Boulder Milling Inc → Boulder Milling Incorporated**

- 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:** Hendricks-Good Milling Company → Boulder Milling Incorporated; 1950-01-01 to 1984-04-24; source msha-controller-operator-history
- **controller_controls_mine:** Hendricks Minerals → Boulder Milling Incorporated; 1950-01-01 to 1984-04-24; source msha-controller-operator-history
- **controller_controls_operator:** Hendricks Minerals → Hendricks-Good Milling Company; 1950-01-01 to 1984-04-24; source msha-controller-operator-history
- **operator_operates_mine:** Hendricks Milling Company → Boulder Milling Incorporated; 1984-04-25 to 1985-07-31; source msha-controller-operator-history
- **controller_controls_mine:** North American Power Petroleums Inc → Boulder Milling Incorporated; 1984-04-25 to 1985-07-31; source msha-controller-operator-history
- **controller_controls_operator:** North American Power Petroleums Inc → Hendricks Milling Company; 1984-04-25 to 1985-07-31; source msha-controller-operator-history
- **operator_operates_mine:** Boulder Milling Inc → Boulder Milling Incorporated; 1985-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hendricks Thomas & Jennifer Nowak → Boulder Milling Incorporated; 1985-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hendricks Thomas & Jennifer Nowak → Boulder Milling Inc; 1985-08-01 to current/open; source msha-controller-operator-history