# Relationship history for MSHA mine 1001437

Current hierarchy: **Gibson Craig L → American Paving Company → American Paving 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Wardle P R → American Paving Company; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Ada Sand & Gravel Inc → American Paving Company; 1980-01-01 to 1985-04-08; source msha-controller-operator-history
- **controller_controls_operator:** Wardle P R → Ada Sand & Gravel Inc; 1980-01-01 to 1985-04-08; source msha-controller-operator-history
- **operator_operates_mine:** Ada Sand & Gravel & Construction Company → American Paving Company; 1985-04-09 to 1988-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Gene M  Ranstrom → American Paving Company; 1985-04-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gene M  Ranstrom → Ada Sand & Gravel & Construction Company; 1985-04-09 to 1988-05-31; source msha-controller-operator-history
- **operator_operates_mine:** American Paving Company → American Paving Company; 1988-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Gibson Craig L → American Paving Company; 1988-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gibson Craig L → American Paving Company; 1988-06-01 to current/open; source msha-controller-operator-history