# Relationship history for MSHA mine 3607316

Current hierarchy: **Kocher Richard D → Snapper Coal Company → No 1 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:** Golden Mine Coal Company → No 1 Slope; 1982-06-01 to 1982-07-25; source msha-controller-operator-history
- **controller_controls_mine:** Lucas Robert T Et Al → No 1 Slope; 1982-06-01 to 1982-07-25; source msha-controller-operator-history
- **controller_controls_operator:** Lucas Robert T Et Al → Golden Mine Coal Company; 1982-06-01 to 1982-07-25; source msha-controller-operator-history
- **operator_operates_mine:** Snapper Coal Company → No 1 Slope; 1982-07-26 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kocher Richard D Et Al → No 1 Slope; 1982-07-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kocher Richard D Et Al → Snapper Coal Company; 1982-07-26 to current/open; source msha-controller-operator-history