# Relationship history for MSHA mine 3901075

Current hierarchy: **Peterson Dwayne → Peterson Construction → Shaffer Pit**

- 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

- **operator_operates_mine:** Rechnagel Construction Inc → Shaffer Pit; 1950-01-01 to 1980-10-27; source msha-controller-operator-history
- **controller_controls_mine:** Lyle P  Rechnagel → Shaffer Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lyle P  Rechnagel → Rechnagel Construction Inc; 1950-01-01 to 1980-10-27; source msha-controller-operator-history
- **operator_operates_mine:** Peterson Construction → Shaffer Pit; 1980-10-28 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Peterson Dwayne → Shaffer Pit; 1980-10-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Peterson Dwayne → Peterson Construction; 1980-10-28 to current/open; source msha-controller-operator-history