# Relationship history for MSHA mine 1503844

Current hierarchy: **Natomas Company → Brown Badgett Inc → Island No 9 Strip**

- 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

- **controller_controls_mine:** Badgett Brown Jr → Island No 9 Strip; 1970-09-01 to 1978-04-25; source msha-controller-operator-history
- **operator_operates_mine:** Brown Badgett Inc → Island No 9 Strip; 1970-10-02 to 1978-04-25; source msha-controller-operator-history
- **controller_controls_operator:** Badgett Brown Jr → Brown Badgett Inc; 1970-10-02 to 1978-04-25; source msha-controller-operator-history
- **operator_operates_mine:** Brown Badgett Inc → Island No 9 Strip; 1978-04-26 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Natomas Company → Island No 9 Strip; 1978-04-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Natomas Company → Brown Badgett Inc; 1978-04-26 to current/open; source msha-controller-operator-history