# Relationship history for MSHA mine 2101460

Current hierarchy: **Jack  Kielmeyer → Kielmeyer Construction Inc → Kielmeyer Dakota County S & G**

- 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:** Kielmeyer Construction Inc → Kielmeyer Dakota County S & G; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Douglas  Kielmeyer → Kielmeyer Dakota County S & G; 1950-01-01 to 2022-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Douglas  Kielmeyer → Kielmeyer Construction Inc; 1950-01-01 to 2022-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Jack  Kielmeyer → Kielmeyer Dakota County S & G; 2023-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jack  Kielmeyer → Kielmeyer Construction Inc; 2023-01-01 to current/open; source msha-controller-operator-history