# Relationship history for MSHA mine 4103372

Current hierarchy: **Merritt James P → San Jacinto Excavation Corp → San Jacinto Excavation Corporation**

- 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:** Sand Excavation Company → San Jacinto Excavation Corporation; 1986-01-01 to 1986-03-12; source msha-controller-operator-history
- **controller_controls_mine:** Crisp Billy & J B West → San Jacinto Excavation Corporation; 1986-01-01 to 1986-03-12; source msha-controller-operator-history
- **controller_controls_operator:** Crisp Billy & J B West → Sand Excavation Company; 1986-01-01 to 1986-03-12; source msha-controller-operator-history
- **operator_operates_mine:** Sand Excavation Inc → San Jacinto Excavation Corporation; 1986-03-13 to 1989-02-28; source msha-controller-operator-history
- **controller_controls_mine:** Shelton Carl B → San Jacinto Excavation Corporation; 1986-03-13 to 1989-02-28; source msha-controller-operator-history
- **controller_controls_operator:** Shelton Carl B → Sand Excavation Inc; 1986-03-13 to 1989-02-28; source msha-controller-operator-history
- **operator_operates_mine:** San Jacinto Excavation Corp → San Jacinto Excavation Corporation; 1989-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Merritt James P → San Jacinto Excavation Corporation; 1989-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Merritt James P → San Jacinto Excavation Corp; 1989-03-01 to current/open; source msha-controller-operator-history