# Relationship history for MSHA mine 2003080

Current hierarchy: **Alan E  Seng → Al Seng Sand & Stone → PIONEER**

- 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:** Alan E  Seng → PIONEER; 1988-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Al Seng Sand & Stone → PIONEER; 1998-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Alan E  Seng → Al Seng Sand & Stone; 1998-07-01 to current/open; source msha-controller-operator-history