# Relationship history for MSHA mine 4103770

Current hierarchy: **Coke  Smith → Gravelco Inc → GRAVELCO, INC.**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Gravelco Inc → GRAVELCO, INC.; 1993-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Coke  Smith → GRAVELCO, INC.; 1993-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Coke  Smith → Gravelco Inc; 1993-05-01 to current/open; source msha-controller-operator-history