# Relationship history for MSHA mine 1101835

Current hierarchy: **Frank J  Beelman III → Columbia Quarry Company LLC → Waterloo Plant #7**

- 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:** Clyde D  Trexler → Waterloo Plant #7; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Quality Stone Company Inc → Waterloo Plant #7; 1950-01-01 to 1996-01-31; source msha-controller-operator-history
- **controller_controls_mine:** Cletus  Lischer → Waterloo Plant #7; 1950-01-01 to 1996-01-31; source msha-controller-operator-history
- **controller_controls_operator:** Cletus  Lischer → Quality Stone Company Inc; 1950-01-01 to 1996-01-31; source msha-controller-operator-history
- **operator_operates_mine:** Columbia Quarry Company → Waterloo Plant #7; 1996-02-01 to 2010-05-07; source msha-controller-operator-history
- **controller_controls_operator:** Clyde D  Trexler → Columbia Quarry Company; 1996-02-01 to 2010-05-07; source msha-controller-operator-history
- **operator_operates_mine:** Columbia Quarry Company LLC → Waterloo Plant #7; 2010-05-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Frank J  Beelman III → Waterloo Plant #7; 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