# Relationship history for MSHA mine 0503612

Current hierarchy: **Seymour Frank L & Kimball J M Cormack → S S & S Company → Lincoln**

- 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:** Graham Robert H Et Al → Lincoln; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Graham Mining → Lincoln; 1980-12-01 to 1983-05-19; source msha-controller-operator-history
- **controller_controls_operator:** Graham Robert H Et Al → Graham Mining; 1980-12-01 to 1983-05-19; source msha-controller-operator-history
- **operator_operates_mine:** S S & S Company → Lincoln; 1983-05-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Seymour Frank L & Kimball J M Cormack → Lincoln; 1983-05-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Seymour Frank L & Kimball J M Cormack → S S & S Company; 1983-05-20 to current/open; source msha-controller-operator-history