# Relationship history for MSHA mine 3601888

Current hierarchy: **Frank M  Neumeister → Neumeister Coal Company → No 1 Slope 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Klinger Coal Company → No 1 Slope Mine; 1950-01-01 to 1977-06-29; source msha-controller-operator-history
- **controller_controls_mine:** Klinger Earl → No 1 Slope Mine; 1950-01-01 to 1977-06-29; source msha-controller-operator-history
- **controller_controls_operator:** Klinger Earl → Klinger Coal Company; 1950-01-01 to 1977-06-29; source msha-controller-operator-history
- **operator_operates_mine:** Dembinsky Coal Company → No 1 Slope Mine; 1977-06-30 to 1981-08-10; source msha-controller-operator-history
- **controller_controls_mine:** Dembinsky Nicholas & Frank Neumeister → No 1 Slope Mine; 1977-06-30 to 1981-08-10; source msha-controller-operator-history
- **controller_controls_operator:** Dembinsky Nicholas & Frank Neumeister → Dembinsky Coal Company; 1977-06-30 to 1981-08-10; source msha-controller-operator-history
- **controller_controls_mine:** Frank M  Neumeister → No 1 Slope Mine; 1981-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Neumeister Coal Company → No 1 Slope Mine; 1981-08-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Frank M  Neumeister → Neumeister Coal Company; 1981-08-11 to current/open; source msha-controller-operator-history