# Relationship history for MSHA mine 4605876

Current hierarchy: **Billings J H → J & H Corp → Derosier Tipple**

- 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:** J & H Corp → Derosier Tipple; 1978-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Billings J H → Derosier Tipple; 1978-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Billings J H → J & H Corp; 1978-09-01 to current/open; source msha-controller-operator-history