# Relationship history for MSHA mine 1517420

Current hierarchy: **Ted  Taylor → Tds Coals Inc → Shannon #6**

- 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

- **controller_controls_mine:** Ted  Taylor → Shannon #6; 1987-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Tds Coals Inc → Shannon #6; 1993-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ted  Taylor → Tds Coals Inc; 1993-07-01 to current/open; source msha-controller-operator-history