# Relationship history for MSHA mine 4503132

Current hierarchy: **Kim  Mickelson → Cowlitz Sand & Gravel Inc → Elma Pit**

- 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:** Breck'S Gravel → Elma Pit; 1987-05-01 to 2000-11-02; source msha-controller-operator-history
- **controller_controls_mine:** William  Breckenridge → Elma Pit; 1987-05-01 to 2000-11-02; source msha-controller-operator-history
- **controller_controls_operator:** William  Breckenridge → Breck'S Gravel; 1987-05-01 to 2000-11-02; source msha-controller-operator-history
- **controller_controls_mine:** Larry A  Clerget  et al → Elma Pit; 1995-03-29 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Cascade Sand & Gravel Inc → Elma Pit; 2000-11-03 to 2005-06-20; source msha-controller-operator-history
- **controller_controls_operator:** Larry A  Clerget  et al → Cascade Sand & Gravel Inc; 2000-11-03 to 2005-06-20; source msha-controller-operator-history
- **controller_controls_operator:** Joe B  Clerget  et al → Cascade Sand & Gravel Inc; 2000-11-03 to 2005-06-20; source msha-controller-operator-history
- **operator_operates_mine:** Harbor Cascade Inc → Elma Pit; 2005-06-21 to 2006-09-05; source msha-controller-operator-history
- **controller_controls_mine:** Jas  Sangha → Elma Pit; 2005-06-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jas  Sangha → Harbor Cascade Inc; 2005-06-21 to 2006-09-05; source msha-controller-operator-history
- **operator_operates_mine:** Cowlitz Sand & Gravel Inc → Elma Pit; 2006-09-06 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kim  Mickelson → Elma Pit; 2006-09-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kim  Mickelson → Cowlitz Sand & Gravel Inc; 2006-09-06 to current/open; source msha-controller-operator-history