# Relationship history for MSHA mine 2002856

Current hierarchy: **RR Holdco, Inc. → Elmer's Crane and Dozer, Inc. → KPI-JCI Screen #1179**

- 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:** Steve  Drenth → KPI-JCI Screen #1179; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Troy L  Broad et al → KPI-JCI Screen #1179; 1986-04-01 to 2023-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Drenth Brothers Inc → KPI-JCI Screen #1179; 1990-10-01 to 2010-04-15; source msha-controller-operator-history
- **controller_controls_operator:** Steve  Drenth → Drenth Brothers Inc; 1990-10-01 to 2010-04-15; source msha-controller-operator-history
- **operator_operates_mine:** Elmer's Crane and Dozer, Inc. → KPI-JCI Screen #1179; 2010-04-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Troy L  Broad et al → Elmer's Crane and Dozer, Inc.; 2010-04-16 to 2023-05-31; source msha-controller-operator-history
- **controller_controls_mine:** RR Holdco, Inc. → KPI-JCI Screen #1179; 2023-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** RR Holdco, Inc. → Elmer's Crane and Dozer, Inc.; 2023-06-01 to current/open; source msha-controller-operator-history