# Relationship history for MSHA mine 1507945

Current hierarchy: **Bowling & Burke Coal Co → Bowling & Burke Coal Co → No 402 Mine**

- 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:** Bowling & Burke Coal Co → No 402 Mine; 1974-09-27 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Bowling & Burke Coal Co → No 402 Mine; 1975-01-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bowling & Burke Coal Co → Bowling & Burke Coal Co; 1975-01-06 to current/open; source msha-controller-operator-history