# Relationship history for MSHA mine 3606972

Current hierarchy: **Manhart Leroy C & Michael Roseman → M & R Coal Company → Orchard 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

- **controller_controls_mine:** Smith Darvin C--Allen R Kramer Et Al → Orchard Slope; 1978-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** New Way Coal Company → Orchard Slope; 1980-04-01 to 1984-01-19; source msha-controller-operator-history
- **controller_controls_operator:** Smith Darvin C--Allen R Kramer Et Al → New Way Coal Company; 1980-04-01 to 1984-01-19; source msha-controller-operator-history
- **operator_operates_mine:** M & R Coal Company → Orchard Slope; 1984-01-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Manhart Leroy C & Michael Roseman → Orchard Slope; 1984-01-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Manhart Leroy C & Michael Roseman → M & R Coal Company; 1984-01-20 to current/open; source msha-controller-operator-history