# Relationship history for MSHA mine 1511615

Current hierarchy: **Horace Garrison  Hill → D & C Mining Corp → F&D Tipple**

- 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:** New Harlan Block Coal Company Inc → F&D Tipple; 1978-10-01 to 1996-12-09; source msha-controller-operator-history
- **controller_controls_mine:** Nicholas  Saylor et al → F&D Tipple; 1978-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Nicholas  Saylor et al → New Harlan Block Coal Company Inc; 1978-10-01 to 1996-12-09; source msha-controller-operator-history
- **controller_controls_mine:** Horace Garrison  Hill → F&D Tipple; 1995-05-16 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** D & C Mining Corp → F&D Tipple; 1996-12-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Horace Garrison  Hill → D & C Mining Corp; 1996-12-10 to current/open; source msha-controller-operator-history