# Relationship history for MSHA mine 3606478

Current hierarchy: **Nakutis Dennis Sr → D & L Mining Inc → Pitt Gas Mine**

- 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

- **operator_operates_mine:** Canon Coal Company → Pitt Gas Mine; 1977-08-01 to 1986-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Canon Coal Corp & Crescent Hills Coal Co Inc → Pitt Gas Mine; 1977-08-01 to 1986-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Canon Coal Corp & Crescent Hills Coal Co Inc → Canon Coal Company; 1977-08-01 to 1986-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Canon Coal Company Inc → Pitt Gas Mine; 1987-01-01 to 1987-08-04; source msha-controller-operator-history
- **controller_controls_mine:** Atlas Alloys Company Inc → Pitt Gas Mine; 1987-01-01 to 1987-08-04; source msha-controller-operator-history
- **controller_controls_operator:** Atlas Alloys Company Inc → Canon Coal Company Inc; 1987-01-01 to 1987-08-04; source msha-controller-operator-history
- **operator_operates_mine:** Dynamic Recovery Inc → Pitt Gas Mine; 1987-08-05 to 1994-03-27; source msha-controller-operator-history
- **controller_controls_mine:** Hayhurst James W Ii → Pitt Gas Mine; 1987-08-05 to 1995-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Hayhurst James W Ii → Dynamic Recovery Inc; 1987-08-05 to 1994-03-27; source msha-controller-operator-history
- **operator_operates_mine:** D & L Mining Inc → Pitt Gas Mine; 1994-03-28 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Nakutis Dennis Sr → Pitt Gas Mine; 1994-03-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Nakutis Dennis Sr → D & L Mining Inc; 1994-03-28 to current/open; source msha-controller-operator-history