# Relationship history for MSHA mine 2001803

Current hierarchy: **RR Holdco, Inc. → Elmer's Crane and Dozer, Inc. → BLUMKE PIT & MILL**

- 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:** Blumke Bros Redi-Mix and Excavating, Inc. → BLUMKE PIT & MILL; 1950-01-01 to 2020-11-10; source msha-controller-operator-history
- **controller_controls_mine:** Charles  Blumke → BLUMKE PIT & MILL; 1950-01-01 to 2014-06-18; source msha-controller-operator-history
- **controller_controls_operator:** Charles  Blumke → Blumke Bros Redi-Mix and Excavating, Inc.; 1950-01-01 to 2014-06-18; source msha-controller-operator-history
- **controller_controls_mine:** Troy L  Broad et al → BLUMKE PIT & MILL; 1986-04-01 to 2023-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Robert  Blumke → BLUMKE PIT & MILL; 2014-06-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert  Blumke → Blumke Bros Redi-Mix and Excavating, Inc.; 2014-06-19 to 2020-11-10; source msha-controller-operator-history
- **operator_operates_mine:** Elmer's Crane and Dozer, Inc. → BLUMKE PIT & MILL; 2020-11-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Troy L  Broad et al → Elmer's Crane and Dozer, Inc.; 2020-11-11 to 2023-05-31; source msha-controller-operator-history
- **controller_controls_mine:** RR Holdco, Inc. → BLUMKE PIT & MILL; 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