# Relationship history for MSHA mine 0202287

Current hierarchy: **Monty P  Nichols → Nichols Development Corp → Portable Crusher #100 30**

- 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:** Nichols Development Corp → Portable Crusher #100 30; 1986-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Monty P  Nichols → Portable Crusher #100 30; 1986-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Monty P  Nichols → Nichols Development Corp; 1986-01-01 to current/open; source msha-controller-operator-history