# Relationship history for MSHA mine 3608936

Current hierarchy: **Harold L Piasecki Sr → Harold L. Piasecki Sr. → Thomas 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Harold L Piasecki Sr → Thomas Quarry; 2001-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Ray Kilmer Quarries → Thomas Quarry; 2001-03-01 to 2002-07-09; source msha-controller-operator-history
- **controller_controls_mine:** Ray  Kilmer → Thomas Quarry; 2001-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ray  Kilmer → Ray Kilmer Quarries; 2001-03-01 to 2002-07-09; source msha-controller-operator-history
- **operator_operates_mine:** Harold L. Piasecki Sr. → Thomas Quarry; 2002-07-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Harold L Piasecki Sr → Harold L. Piasecki Sr.; 2002-07-10 to current/open; source msha-controller-operator-history