# Relationship history for MSHA mine 1515629

Current hierarchy: **Bowling Jess & Bobby → Red Bird Mining → No1**

- 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:** Clayton Roberts Mining → No1; 1986-05-01 to 1986-09-09; source msha-controller-operator-history
- **controller_controls_mine:** Roberts Clayton → No1; 1986-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Roberts Clayton → Clayton Roberts Mining; 1986-05-01 to 1986-09-09; source msha-controller-operator-history
- **operator_operates_mine:** Bonanza Coal Inc → No1; 1986-09-10 to 1987-06-29; source msha-controller-operator-history
- **controller_controls_mine:** Napier Lonnie → No1; 1986-09-10 to 1987-06-29; source msha-controller-operator-history
- **controller_controls_operator:** Napier Lonnie → Bonanza Coal Inc; 1986-09-10 to 1987-06-29; source msha-controller-operator-history
- **operator_operates_mine:** Red Bird Mining → No1; 1987-06-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bowling Jess & Bobby → No1; 1987-06-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bowling Jess & Bobby → Red Bird Mining; 1987-06-30 to current/open; source msha-controller-operator-history