# Relationship history for MSHA mine 0503155

Current hierarchy: **Bailey Arlie F → Mountain Aggregate 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:** Walter R  Schmidt → Crusher #1; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Schmidt-Tiago Construction Company → Crusher #1; 1978-03-09 to 1981-06-08; source msha-controller-operator-history
- **controller_controls_operator:** Walter R  Schmidt → Schmidt-Tiago Construction Company; 1978-03-09 to 1981-06-08; source msha-controller-operator-history
- **operator_operates_mine:** Palisade Construction Company → Crusher #1; 1981-06-09 to 1986-02-23; source msha-controller-operator-history
- **controller_controls_mine:** Rodgers Construction Companies Inc → Crusher #1; 1981-06-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rodgers Construction Companies Inc → Palisade Construction Company; 1981-06-09 to 1986-02-23; source msha-controller-operator-history
- **operator_operates_mine:** Mountain Aggregate Construction Inc → Crusher #1; 1986-02-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bailey Arlie F → Crusher #1; 1986-02-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bailey Arlie F → Mountain Aggregate Construction Inc; 1986-02-24 to current/open; source msha-controller-operator-history