# Relationship history for MSHA mine 4801427

Current hierarchy: **Ronald  Linch → Sierra Construction Company → Crusher #2**

- 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:** Ronald  Linch → Crusher #2; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Sierra Construction Company → Crusher #2; 1985-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ronald  Linch → Sierra Construction Company; 1985-04-01 to current/open; source msha-controller-operator-history