# Relationship history for MSHA mine 4201650

Current hierarchy: **Holley Ira → Holley Corp → Black Mountain Mill**

- 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:** Mountain Maid Inc → Black Mountain Mill; 1980-01-01 to 1984-04-23; source msha-controller-operator-history
- **controller_controls_mine:** Herdman Frank K-E C Bolton Et Al → Black Mountain Mill; 1980-01-01 to 1984-04-23; source msha-controller-operator-history
- **controller_controls_operator:** Herdman Frank K-E C Bolton Et Al → Mountain Maid Inc; 1980-01-01 to 1984-04-23; source msha-controller-operator-history
- **operator_operates_mine:** Holley Corp → Black Mountain Mill; 1984-04-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Holley Ira → Black Mountain Mill; 1984-04-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Holley Ira → Holley Corp; 1984-04-24 to current/open; source msha-controller-operator-history