# Relationship history for MSHA mine 1100038

Current hierarchy: **Frank J  Beelman III → Columbia Quarry Company LLC → Columbia Plant #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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Columbia Quarry Company → Columbia Plant #1; 1950-01-01 to 2010-05-07; source msha-controller-operator-history
- **controller_controls_mine:** Clyde D  Trexler → Columbia Plant #1; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Clyde D  Trexler → Columbia Quarry Company; 1950-01-01 to 2010-05-07; source msha-controller-operator-history
- **operator_operates_mine:** Columbia Quarry Company LLC → Columbia Plant #1; 2010-05-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Frank J  Beelman III → Columbia Plant #1; 2010-05-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Frank J  Beelman III → Columbia Quarry Company LLC; 2010-05-08 to current/open; source msha-controller-operator-history