# Relationship history for MSHA mine 3607414

Current hierarchy: **Kocher Richard D → Ash Coal Company → 1 1/2 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:** Ash Coal Company → 1 1/2 Vein Slope; 1983-01-01 to 1985-08-26; source msha-controller-operator-history
- **controller_controls_mine:** Gibson George Et Al → 1 1/2 Vein Slope; 1983-01-01 to 1985-08-26; source msha-controller-operator-history
- **controller_controls_operator:** Gibson George Et Al → Ash Coal Company; 1983-01-01 to 1985-08-26; source msha-controller-operator-history
- **operator_operates_mine:** Ash Coal Company → 1 1/2 Vein Slope; 1985-08-27 to 1989-05-04; source msha-controller-operator-history
- **controller_controls_mine:** Kintzel Stephen Et Al → 1 1/2 Vein Slope; 1985-08-27 to 1989-05-04; source msha-controller-operator-history
- **controller_controls_operator:** Kintzel Stephen Et Al → Ash Coal Company; 1985-08-27 to 1989-05-04; source msha-controller-operator-history
- **operator_operates_mine:** Ash Coal Company → 1 1/2 Vein Slope; 1989-05-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kocher Richard D Et Al → 1 1/2 Vein Slope; 1989-05-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kocher Richard D Et Al → Ash Coal Company; 1989-05-05 to current/open; source msha-controller-operator-history