# Relationship history for MSHA mine 1515450

Current hierarchy: **Barker Raymond R → North Fork Mining Company Inc → No 1 Surface**

- 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:** N & N Mining Inc → No 1 Surface; 1985-11-01 to 1986-04-06; source msha-controller-operator-history
- **controller_controls_mine:** Walter R  Neese et  al → No 1 Surface; 1985-11-01 to 1986-04-06; source msha-controller-operator-history
- **controller_controls_operator:** Walter R  Neese et  al → N & N Mining Inc; 1985-11-01 to 1986-04-06; source msha-controller-operator-history
- **operator_operates_mine:** Brushy Fork Coal Company Inc → No 1 Surface; 1986-04-07 to 1986-09-14; source msha-controller-operator-history
- **controller_controls_mine:** Davis Ted → No 1 Surface; 1986-04-07 to 1986-09-14; source msha-controller-operator-history
- **controller_controls_operator:** Davis Ted → Brushy Fork Coal Company Inc; 1986-04-07 to 1986-09-14; source msha-controller-operator-history
- **operator_operates_mine:** North Fork Mining Company Inc → No 1 Surface; 1986-09-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Barker Raymond R → No 1 Surface; 1986-09-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Barker Raymond R → North Fork Mining Company Inc; 1986-09-15 to current/open; source msha-controller-operator-history