# Relationship history for MSHA mine 3601892

Current hierarchy: **RCL Capital LTD → Kocher Coal Company → Porter Tunnel**

- 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

- **operator_operates_mine:** Kocher Coal Company → Porter Tunnel; 1950-01-01 to 1994-10-03; source msha-controller-operator-history
- **controller_controls_mine:** Robert W  Rissinger → Porter Tunnel; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert W  Rissinger → Kocher Coal Company; 1950-01-01 to 1994-10-03; source msha-controller-operator-history
- **operator_operates_mine:** Kocher Coal Company → Porter Tunnel; 1994-10-04 to 2005-04-14; source msha-controller-operator-history
- **controller_controls_mine:** Ronald  Lickman → Porter Tunnel; 1994-10-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ronald  Lickman → Kocher Coal Company; 1994-10-04 to 2005-04-14; source msha-controller-operator-history
- **operator_operates_mine:** Kocher Coal Company → Porter Tunnel; 2005-04-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** RCL Capital LTD et al → Porter Tunnel; 2005-04-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** RCL Capital LTD et al → Kocher Coal Company; 2005-04-15 to current/open; source msha-controller-operator-history