# Relationship history for MSHA mine 1301529

Current hierarchy: **Jerry L  Kinkead → Aggrecon Corp → Arensdorf 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:** B W  Carpenter  et al → Arensdorf Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Dubuque Sand & Gravel Company → Arensdorf Quarry; 1950-01-01 to 1978-08-08; source msha-controller-operator-history
- **controller_controls_mine:** Thompson Floyd → Arensdorf Quarry; 1950-01-01 to 1985-08-04; source msha-controller-operator-history
- **controller_controls_operator:** Thompson Floyd → Dubuque Sand & Gravel Company; 1950-01-01 to 1978-08-08; source msha-controller-operator-history
- **controller_controls_mine:** Jerry L  Kinkead → Arensdorf Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Alpha Crushed Stone Inc → Arensdorf Quarry; 1978-08-09 to 1981-04-16; source msha-controller-operator-history
- **controller_controls_operator:** B W  Carpenter  et al → Alpha Crushed Stone Inc; 1978-08-09 to 1981-04-16; source msha-controller-operator-history
- **operator_operates_mine:** Aggrecon Corp → Arensdorf Quarry; 1981-04-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jerry L  Kinkead → Aggrecon Corp; 1981-04-17 to current/open; source msha-controller-operator-history