# Relationship history for MSHA mine 2602431

Current hierarchy: **John A  Patrick → MPI Ready Mix Inc → Plant #2**

- 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:** Gary  Leavitt → Plant #2; 1986-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Leavitt Ready Mix → Plant #2; 2000-09-01 to 2003-11-03; source msha-controller-operator-history
- **controller_controls_operator:** Gary  Leavitt → Leavitt Ready Mix; 2000-09-01 to 2003-11-03; source msha-controller-operator-history
- **operator_operates_mine:** MPI Ready Mix Inc → Plant #2; 2003-11-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John A  Patrick → Plant #2; 2003-11-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John A  Patrick → MPI Ready Mix Inc; 2003-11-04 to current/open; source msha-controller-operator-history