# Relationship history for MSHA mine 1513746

Current hierarchy: **Tackett Raymond & Grover Helton → Neon Coal Company → No 1 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:** Beargrass Coal Company → No 1 Tipple; 1982-09-01 to 1983-08-15; source msha-controller-operator-history
- **controller_controls_mine:** Sams William B → No 1 Tipple; 1982-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sams William B → Beargrass Coal Company; 1982-09-01 to 1983-08-15; source msha-controller-operator-history
- **operator_operates_mine:** Neon Coal Company → No 1 Tipple; 1983-08-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Tackett Raymond & Grover Helton → No 1 Tipple; 1983-08-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tackett Raymond & Grover Helton → Neon Coal Company; 1983-08-16 to current/open; source msha-controller-operator-history