# Relationship history for MSHA mine 3608493

Current hierarchy: **Ronald  Lickman → Harriman Coal Corp → Keffers West Division**

- 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:** Ronald  Lickman → Keffers West Division; 1984-07-16 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Harriman Coal Corp → Keffers West Division; 1994-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ronald  Lickman → Harriman Coal Corp; 1994-12-01 to current/open; source msha-controller-operator-history