# Relationship history for MSHA mine 0103300

Current hierarchy: **Brian K  McCord; Charles B  Nelson → M & N Materials Inc → Gurley  Mine**

- 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:** M & N Materials Inc → Gurley  Mine; 2004-08-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Charles B  Nelson et al → Gurley  Mine; 2004-08-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Charles B  Nelson et al → M & N Materials Inc; 2004-08-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brian K  McCord et al → M & N Materials Inc; 2004-08-30 to current/open; source msha-controller-operator-history