# Relationship history for MSHA mine 1513360

Current hierarchy: **Nickles Harold G → N & L Coal Company Inc → N & L #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

- **operator_operates_mine:** Hollybush Coal Company Inc → N & L #1; 1982-02-01 to 1984-02-14; source msha-controller-operator-history
- **controller_controls_mine:** Dixon Hansel & Bill → N & L #1; 1982-02-01 to 1984-02-14; source msha-controller-operator-history
- **controller_controls_operator:** Dixon Hansel & Bill → Hollybush Coal Company Inc; 1982-02-01 to 1984-02-14; source msha-controller-operator-history
- **operator_operates_mine:** N & L Coal Company Inc → N & L #1; 1984-02-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Nickles Harold G → N & L #1; 1984-02-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Nickles Harold G → N & L Coal Company Inc; 1984-02-15 to current/open; source msha-controller-operator-history