# Relationship history for MSHA mine 1515518

Current hierarchy: **Glen D  Pope → Valley Development Mining Company Inc → #1 Surface**

- 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:** Glen D  Pope → #1 Surface; 1982-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Valley Development Mining Company Inc → #1 Surface; 1986-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Glen D  Pope → Valley Development Mining Company Inc; 1986-01-01 to current/open; source msha-controller-operator-history