# Relationship history for MSHA mine 4503180

Current hierarchy: **Don  Merlino; Gary  Merlino → Stoneway Rock & Recycling → Black River Quarry**

- 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:** Stoneway Rock & Recycling → Black River Quarry; 1988-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Don  Merlino et al → Black River Quarry; 1988-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Don  Merlino et al → Stoneway Rock & Recycling; 1988-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gary  Merlino et al → Stoneway Rock & Recycling; 1988-09-01 to current/open; source msha-controller-operator-history