# Relationship history for MSHA mine 1201448

Current hierarchy: **Denis  Prechtel → Old Erin Coal Company → Old Erin #3 Strip**

- 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:** Old Erin Coal Company → Old Erin #3 Strip; 1975-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Denis  Prechtel → Old Erin #3 Strip; 1975-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Denis  Prechtel → Old Erin Coal Company; 1975-05-01 to current/open; source msha-controller-operator-history