# Relationship history for MSHA mine 1516504

Current hierarchy: **Taylor Ted & Phillip → Tripple T Coal Company → Site #1**

- 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:** Tripple T Coal Company → Site #1; 1988-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Taylor Ted & Phillip Et Al → Site #1; 1988-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Taylor Ted & Phillip Et Al → Tripple T Coal Company; 1988-10-01 to current/open; source msha-controller-operator-history