# Relationship history for MSHA mine 4608960

Current hierarchy: **David  Cline → Rock 'N' Roll Coal Company, Inc. → Mine No. 4**

- 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:** David  Cline → Mine No. 4; 1995-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Rock 'N' Roll Coal Company, Inc. → Mine No. 4; 2002-04-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David  Cline → Rock 'N' Roll Coal Company, Inc.; 2002-04-24 to current/open; source msha-controller-operator-history