# Relationship history for MSHA mine 1510786

Current hierarchy: **Newsome Denny → Robinson Creek Coal Company Inc → No 1 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** K & N Coal Company Inc → No 1 Mine; 1977-09-01 to 1978-09-10; source msha-controller-operator-history
- **controller_controls_mine:** Kiser Jarvey & Herbert → No 1 Mine; 1977-09-01 to 1978-09-10; source msha-controller-operator-history
- **controller_controls_operator:** Kiser Jarvey & Herbert → K & N Coal Company Inc; 1977-09-01 to 1978-09-10; source msha-controller-operator-history
- **operator_operates_mine:** Elkhorn Venture → No 1 Mine; 1978-09-11 to 1980-01-28; source msha-controller-operator-history
- **controller_controls_mine:** Bradley Charles W & Robert E L Bowman → No 1 Mine; 1978-09-11 to 1980-01-28; source msha-controller-operator-history
- **controller_controls_operator:** Bradley Charles W & Robert E L Bowman → Elkhorn Venture; 1978-09-11 to 1980-01-28; source msha-controller-operator-history
- **operator_operates_mine:** Robinson Creek Coal Company Inc → No 1 Mine; 1980-01-29 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Newsome Denny → No 1 Mine; 1980-01-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Newsome Denny → Robinson Creek Coal Company Inc; 1980-01-29 to current/open; source msha-controller-operator-history