# Relationship history for MSHA mine 2902008

Current hierarchy: **Braziel Tom → Skyline Enterprises → Skyline Enterprises**

- 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:** Runyan & Son → Skyline Enterprises; 1985-11-01 to 1987-04-21; source msha-controller-operator-history
- **controller_controls_mine:** Runyan Dave (Sonny) → Skyline Enterprises; 1985-11-01 to 1987-04-21; source msha-controller-operator-history
- **controller_controls_operator:** Runyan Dave (Sonny) → Runyan & Son; 1985-11-01 to 1987-04-21; source msha-controller-operator-history
- **operator_operates_mine:** Skyline Enterprises → Skyline Enterprises; 1987-04-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Braziel Tom Et Al → Skyline Enterprises; 1987-04-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Braziel Tom Et Al → Skyline Enterprises; 1987-04-22 to current/open; source msha-controller-operator-history