# Relationship history for MSHA mine 3608143

Current hierarchy: **Joseph  Kleeman → Pac 23 Mining Company → Continental Strip**

- 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:** Elwood  Swank → Continental Strip; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Joseph  Kleeman  et al → Continental Strip; 1987-12-22 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Pac 23 Mining Company → Continental Strip; 1990-01-01 to 1990-05-29; source msha-controller-operator-history
- **controller_controls_operator:** Joseph  Kleeman  et al → Pac 23 Mining Company; 1990-01-01 to 1990-05-29; source msha-controller-operator-history
- **operator_operates_mine:** Split Vein Coal Company Inc → Continental Strip; 1990-05-30 to 1992-04-06; source msha-controller-operator-history
- **controller_controls_operator:** Elwood  Swank → Split Vein Coal Company Inc; 1990-05-30 to 1992-04-06; source msha-controller-operator-history
- **operator_operates_mine:** Pac 23 Mining Company → Continental Strip; 1992-04-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Joseph  Kleeman  et al → Pac 23 Mining Company; 1992-04-07 to current/open; source msha-controller-operator-history