# Relationship history for MSHA mine 3901252

Current hierarchy: **Boggs William → William Boggs Mining → Bald #4**

- 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

- **controller_controls_mine:** Boggs William → Bald #4; 1979-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** William Boggs Mining → Bald #4; 1980-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Boggs William → William Boggs Mining; 1980-09-01 to current/open; source msha-controller-operator-history