# Relationship history for MSHA mine 3607003

Current hierarchy: **Thomas J  Lynott → Columbia Coal & Development Company Inc → Logan No 2**

- 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:** Thomas J  Lynott → Logan No 2; 1979-04-03 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Columbia Coal & Development Company Inc → Logan No 2; 1980-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thomas J  Lynott → Columbia Coal & Development Company Inc; 1980-07-01 to current/open; source msha-controller-operator-history