# Relationship history for MSHA mine 0503497

Current hierarchy: **Pyle Denver → Tri-Island Land & Cattle Company Inc → Mad Jack No 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Tri-Island Land & Cattle Company Inc → Mad Jack No 1; 1979-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Pyle Denver → Mad Jack No 1; 1979-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Pyle Denver → Tri-Island Land & Cattle Company Inc; 1979-10-01 to current/open; source msha-controller-operator-history