# Relationship history for MSHA mine 5001554

Current hierarchy: **Klukwan Inc → South Coast Inc → S C Portable Crusher #3 Impact**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Richard  Standerfer → S C Portable Crusher #3 Impact; 1979-04-19 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** South Coast Inc → S C Portable Crusher #3 Impact; 1988-06-01 to 1991-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Richard  Standerfer → South Coast Inc; 1988-06-01 to 1991-06-30; source msha-controller-operator-history
- **operator_operates_mine:** South Coast Inc → S C Portable Crusher #3 Impact; 1991-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Klukwan Inc → S C Portable Crusher #3 Impact; 1991-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Klukwan Inc → South Coast Inc; 1991-07-01 to current/open; source msha-controller-operator-history