# Relationship history for MSHA mine 1512015

Current hierarchy: **Hopkins Bill → Hop Coal Inc → No 1 Perry**

- 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:** Hopkins Bill → No 1 Perry; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Howard Brothers Coal Inc → No 1 Perry; 1979-07-01 to 1980-01-20; source msha-controller-operator-history
- **controller_controls_mine:** Howard Kernie → No 1 Perry; 1979-07-01 to 1980-01-20; source msha-controller-operator-history
- **controller_controls_operator:** Howard Kernie → Howard Brothers Coal Inc; 1979-07-01 to 1980-01-20; source msha-controller-operator-history
- **operator_operates_mine:** Hop Coal Inc → No 1 Perry; 1980-01-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hopkins Bill → Hop Coal Inc; 1980-01-21 to current/open; source msha-controller-operator-history