# Relationship history for MSHA mine 1301783

Current hierarchy: **Jeff A  Carlson → Ulland Brothers Inc → Pioneer 5ove Crusher (1218)**

- 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

- **controller_controls_mine:** Orlin L  Ofstad et al → Pioneer 5ove Crusher (1218); 1950-01-01 to 2020-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Emil Olson Inc → Pioneer 5ove Crusher (1218); 1950-01-01 to 1984-04-30; source msha-controller-operator-history
- **controller_controls_mine:** Olson Roger Emil → Pioneer 5ove Crusher (1218); 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Olson Roger Emil → Emil Olson Inc; 1950-01-01 to 1984-04-30; source msha-controller-operator-history
- **operator_operates_mine:** Ulland Brothers Inc → Pioneer 5ove Crusher (1218); 1984-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Orlin L  Ofstad et al → Ulland Brothers Inc; 1984-05-01 to 2020-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Jeff A  Carlson → Pioneer 5ove Crusher (1218); 2021-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jeff A  Carlson → Ulland Brothers Inc; 2021-01-01 to current/open; source msha-controller-operator-history