# Relationship history for MSHA mine 2003187

Current hierarchy: **RR Holdco, Inc. → Elmer's Crane & Dozer Inc → CedarRapids Jaw Crusher #957**

- 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:** Troy L  Broad et al → CedarRapids Jaw Crusher #957; 1986-04-01 to 2023-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Elmer's Crane & Dozer Inc → CedarRapids Jaw Crusher #957; 2001-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Troy L  Broad et al → Elmer's Crane & Dozer Inc; 2001-03-01 to 2023-05-31; source msha-controller-operator-history
- **controller_controls_mine:** RR Holdco, Inc. → CedarRapids Jaw Crusher #957; 2023-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** RR Holdco, Inc. → Elmer's Crane & Dozer Inc; 2023-06-01 to current/open; source msha-controller-operator-history