# Relationship history for MSHA mine 0203040

Current hierarchy: **Monty P  Nichols → Triple Nichol, Inc. → Triple Nichol - Miami 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:** Monty P  Nichols → Triple Nichol - Miami Crusher; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Triple Nichol, Inc. → Triple Nichol - Miami Crusher; 2004-03-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Monty P  Nichols → Triple Nichol, Inc.; 2004-03-08 to current/open; source msha-controller-operator-history