# Relationship history for MSHA mine 1519064

Current hierarchy: **Gary N  Boyd → Boyd Contracting Inc → Surface Mine #1**

- 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:** Gary N  Boyd → Surface Mine #1; 2005-04-07 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Boyd Contracting Inc → Surface Mine #1; 2006-12-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gary N  Boyd → Boyd Contracting Inc; 2006-12-05 to current/open; source msha-controller-operator-history