# Relationship history for MSHA mine 2001352

Current hierarchy: **Kevin M  Havelka; Jeremy A  Havelka → Havelka Construction, LLC. → Havelka Quarry**

- 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:** Havelka Construction → Havelka Quarry; 1950-01-01 to 2017-04-20; source msha-controller-operator-history
- **controller_controls_mine:** Gerald  Havelka → Havelka Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gerald  Havelka → Havelka Construction; 1950-01-01 to 2017-04-20; source msha-controller-operator-history
- **operator_operates_mine:** Havelka Construction LLC → Havelka Quarry; 2017-04-21 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kevin M  Havelka et al → Havelka Quarry; 2017-04-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kevin M  Havelka et al → Havelka Construction LLC; 2017-04-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jeremy A  Havelka et al → Havelka Construction LLC; 2017-04-21 to current/open; source msha-controller-operator-history