# Relationship history for MSHA mine 4201966

Current hierarchy: **Hamilton Lynn F → Skewes & Hamilton Construction Inc → Crusher #1**

- 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:** Hamilton Lynn F → Crusher #1; 1984-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Skewes & Hamilton Construction Inc → Crusher #1; 1986-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hamilton Lynn F → Skewes & Hamilton Construction Inc; 1986-01-01 to current/open; source msha-controller-operator-history