# Relationship history for MSHA mine 4702755

Current hierarchy: **Steven M  Kropp; Randall P  Kropp → Kropp Trucking, Inc. → Stangleville Pit**

- 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

- **operator_operates_mine:** Lawrence Kropp Trucking → Stangleville Pit; 1983-05-01 to 1992-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Lawrence  Kropp → Stangleville Pit; 1983-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lawrence  Kropp → Lawrence Kropp Trucking; 1983-05-01 to 1992-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Kropp Trucking Inc → Stangleville Pit; 1992-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Randall P  Kropp et al → Stangleville Pit; 1992-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Randall P  Kropp et al → Kropp Trucking Inc; 1992-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Steven M  Kropp et al → Kropp Trucking Inc; 1992-04-01 to current/open; source msha-controller-operator-history