# Relationship history for MSHA mine 3602000

Current hierarchy: **Darryl  Koperna → Fox Coal Company → Little Vein Slope**

- 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:** Shomper Coal Company → Little Vein Slope; 1950-01-01 to 1975-06-04; source msha-controller-operator-history
- **controller_controls_mine:** Shomper Russell → Little Vein Slope; 1950-01-01 to 1975-06-04; source msha-controller-operator-history
- **controller_controls_operator:** Shomper Russell → Shomper Coal Company; 1950-01-01 to 1975-06-04; source msha-controller-operator-history
- **operator_operates_mine:** Artz Coal Company → Little Vein Slope; 1975-06-05 to 1982-04-14; source msha-controller-operator-history
- **controller_controls_mine:** Artz Marvin → Little Vein Slope; 1975-06-05 to 1982-04-14; source msha-controller-operator-history
- **controller_controls_operator:** Artz Marvin → Artz Coal Company; 1975-06-05 to 1982-04-14; source msha-controller-operator-history
- **operator_operates_mine:** Maple Leaf Mining → Little Vein Slope; 1982-04-15 to 1986-11-19; source msha-controller-operator-history
- **controller_controls_mine:** Sheehan Terence → Little Vein Slope; 1982-04-15 to 1986-11-19; source msha-controller-operator-history
- **controller_controls_operator:** Sheehan Terence → Maple Leaf Mining; 1982-04-15 to 1986-11-19; source msha-controller-operator-history
- **operator_operates_mine:** Fox Coal Company → Little Vein Slope; 1986-11-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Darryl  Koperna → Little Vein Slope; 1986-11-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Darryl  Koperna → Fox Coal Company; 1986-11-20 to current/open; source msha-controller-operator-history