# Relationship history for MSHA mine 1510975

Current hierarchy: **Cole Wayne C → Providence B & T Coal Company Inc → No 2 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Providence B & T Coal Company Inc → No 2 Strip; 1977-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Cole Wayne C → No 2 Strip; 1977-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cole Wayne C → Providence B & T Coal Company Inc; 1977-11-01 to current/open; source msha-controller-operator-history