# Relationship history for MSHA mine 5001621

Current hierarchy: **Alan  See; Tim  Schwanke → Alaska Rock-Div/Summit Alaska Inc → Main Crusher 2s**

- 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:** Summit Paving & Construction Inc → Main Crusher 2s; 1994-06-01 to 2000-04-19; source msha-controller-operator-history
- **controller_controls_mine:** Gerald  Des Jarlais → Main Crusher 2s; 1994-06-01 to 2000-04-19; source msha-controller-operator-history
- **controller_controls_operator:** Gerald  Des Jarlais → Summit Paving & Construction Inc; 1994-06-01 to 2000-04-19; source msha-controller-operator-history
- **controller_controls_mine:** Alan  See  et al → Main Crusher 2s; 2000-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Alaska Rock-Div/Summit Alaska Inc → Main Crusher 2s; 2000-04-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Alan  See  et al → Alaska Rock-Div/Summit Alaska Inc; 2000-04-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tim  Schwanke  et al → Alaska Rock-Div/Summit Alaska Inc; 2000-04-20 to current/open; source msha-controller-operator-history