# Relationship history for MSHA mine 1300219

Current hierarchy: **Jerry L  Kinkead → Aggrecon Corp → Preston 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

- **operator_operates_mine:** F J Trenkamp-Owner → Preston Quarry; 1950-01-01 to 1980-10-07; source msha-controller-operator-history
- **controller_controls_mine:** Trenkamp F J → Preston Quarry; 1950-01-01 to 1980-10-07; source msha-controller-operator-history
- **controller_controls_operator:** Trenkamp F J → F J Trenkamp-Owner; 1950-01-01 to 1980-10-07; source msha-controller-operator-history
- **controller_controls_mine:** Jerry L  Kinkead → Preston Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Aggrecon Corp → Preston Quarry; 1980-10-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jerry L  Kinkead → Aggrecon Corp; 1980-10-08 to current/open; source msha-controller-operator-history