# Relationship history for MSHA mine 4700401

Current hierarchy: **Schmied Dave → Dave'S Trucking → Kaddatz Gravel Company**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **controller_controls_mine:** Robert M  Shea → Kaddatz Gravel Company; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Martin Kadatz Gravel Company → Kaddatz Gravel Company; 1950-01-01 to 1980-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Kadatz Martin → Kaddatz Gravel Company; 1950-01-01 to 1980-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Kadatz Martin → Martin Kadatz Gravel Company; 1950-01-01 to 1980-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Kaddatz Gravel Company Inc → Kaddatz Gravel Company; 1980-04-01 to 1980-08-26; source msha-controller-operator-history
- **controller_controls_mine:** Hoefler Carl → Kaddatz Gravel Company; 1980-04-01 to 1980-08-26; source msha-controller-operator-history
- **controller_controls_operator:** Hoefler Carl → Kaddatz Gravel Company Inc; 1980-04-01 to 1980-08-26; source msha-controller-operator-history
- **operator_operates_mine:** Wingra Stone Company → Kaddatz Gravel Company; 1980-08-27 to 1983-10-25; source msha-controller-operator-history
- **controller_controls_operator:** Robert M  Shea → Wingra Stone Company; 1980-08-27 to 1983-10-25; source msha-controller-operator-history
- **operator_operates_mine:** Dave'S Trucking → Kaddatz Gravel Company; 1983-10-26 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Schmied Dave → Kaddatz Gravel Company; 1983-10-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Schmied Dave → Dave'S Trucking; 1983-10-26 to current/open; source msha-controller-operator-history