# Relationship history for MSHA mine 3303795

Current hierarchy: **Hoffman R D → Allied Coal Producers Inc → Cambridge Strip**

- 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:** Hoffman R D → Cambridge Strip; 1979-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** C & P Mining Inc → Cambridge Strip; 1979-12-01 to 1980-09-14; source msha-controller-operator-history
- **controller_controls_mine:** Miller Abe → Cambridge Strip; 1979-12-01 to 1980-09-14; source msha-controller-operator-history
- **controller_controls_operator:** Miller Abe → C & P Mining Inc; 1979-12-01 to 1980-09-14; source msha-controller-operator-history
- **operator_operates_mine:** John L Davis Inc → Cambridge Strip; 1980-09-15 to 1982-01-27; source msha-controller-operator-history
- **controller_controls_mine:** Davis John L → Cambridge Strip; 1980-09-15 to 1982-01-27; source msha-controller-operator-history
- **controller_controls_operator:** Davis John L → John L Davis Inc; 1980-09-15 to 1982-01-27; source msha-controller-operator-history
- **operator_operates_mine:** Allied Coal Producers Inc → Cambridge Strip; 1982-01-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hoffman R D → Allied Coal Producers Inc; 1982-01-28 to current/open; source msha-controller-operator-history