# Relationship history for MSHA mine 4801407

Current hierarchy: **Ronald  Linch → Linch Environmental Contractors 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

- **operator_operates_mine:** Sierra Construction Company → CRUSHER #1; 1950-01-01 to 1989-01-03; source msha-controller-operator-history
- **controller_controls_mine:** Ronald  Linch → CRUSHER #1; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ronald  Linch → Sierra Construction Company; 1950-01-01 to 1989-01-03; source msha-controller-operator-history
- **operator_operates_mine:** Linch Contractors Inc → CRUSHER #1; 1989-01-04 to 2001-08-01; source msha-controller-operator-history
- **controller_controls_mine:** Morse Ronda L → CRUSHER #1; 1989-01-04 to 2001-08-01; source msha-controller-operator-history
- **controller_controls_operator:** Morse Ronda L → Linch Contractors Inc; 1989-01-04 to 2001-08-01; source msha-controller-operator-history
- **operator_operates_mine:** Linch Environmental Contractors Inc → CRUSHER #1; 2001-08-02 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ronald  Linch → CRUSHER #1; 2001-08-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ronald  Linch → Linch Environmental Contractors Inc; 2001-08-02 to current/open; source msha-controller-operator-history