# Relationship history for MSHA mine 3602920

Current hierarchy: **Louis J  Beltrami → Lucky Strike Coal Corp → Bliss Cleaning Plant**

- 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:** Blue Coal Corp → Bliss Cleaning Plant; 1950-01-01 to 1973-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Gillen Thomas J → Bliss Cleaning Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gillen Thomas J → Blue Coal Corp; 1950-01-01 to 1973-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Blue Coal Corp → Bliss Cleaning Plant; 1974-01-01 to 1974-08-14; source msha-controller-operator-history
- **controller_controls_mine:** Great American Coal Company → Bliss Cleaning Plant; 1974-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Great American Coal Company → Blue Coal Corp; 1974-01-01 to 1974-08-14; source msha-controller-operator-history
- **controller_controls_mine:** Louis J  Beltrami → Bliss Cleaning Plant; 1974-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Lucky Strike Coal Corp → Bliss Cleaning Plant; 1974-08-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Louis J  Beltrami → Lucky Strike Coal Corp; 1974-08-15 to current/open; source msha-controller-operator-history