# Relationship history for MSHA mine 2104055

Current hierarchy: **John C  Saldana → Saldana Excavating & Aggregates → Evoquip Impact Crusher**

- 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:** John C  Saldana → Evoquip Impact Crusher; 2004-05-26 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Saldana Excavating & Aggregates → Evoquip Impact Crusher; 2023-09-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John C  Saldana → Saldana Excavating & Aggregates; 2023-09-28 to current/open; source msha-controller-operator-history