# Relationship history for MSHA mine 4503377

Current hierarchy: **Don  Merlino; Gary  Merlino → Kangley Sand & Gravel → KANGLEY**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **controller_controls_mine:** Don  Merlino et al → KANGLEY; 1985-09-06 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Kangley Sand & Gravel → KANGLEY; 1998-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Don  Merlino et al → Kangley Sand & Gravel; 1998-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gary  Merlino et al → Kangley Sand & Gravel; 1998-04-01 to current/open; source msha-controller-operator-history