# Relationship history for MSHA mine 4100289

Current hierarchy: **Deroma SPA → Marshall Pottery Incorporated → Marshall Pits**

- 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:** Marshall Pottery Inc → Marshall Pits; 1950-01-01 to 1984-07-31; source msha-controller-operator-history
- **controller_controls_mine:** Shields  Mitchell → Marshall Pits; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Shields  Mitchell → Marshall Pottery Inc; 1950-01-01 to 1984-07-31; source msha-controller-operator-history
- **operator_operates_mine:** Marshall Pottery → Marshall Pits; 1984-08-01 to 1997-11-16; source msha-controller-operator-history
- **controller_controls_mine:** Charles H  Iles → Marshall Pits; 1984-08-01 to 1997-11-16; source msha-controller-operator-history
- **controller_controls_operator:** Charles H  Iles → Marshall Pottery; 1984-08-01 to 1997-11-16; source msha-controller-operator-history
- **operator_operates_mine:** Marshall Pottery Incorporated → Marshall Pits; 1997-11-17 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Deroma SPA → Marshall Pits; 1997-11-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Deroma SPA → Marshall Pottery Incorporated; 1997-11-17 to current/open; source msha-controller-operator-history