# Relationship history for MSHA mine 4607516

Current hierarchy: **Lancianese John → Smithers Coal & Dock Inc → No 1 Surface Mine**

- 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:** Kmf Corp → No 1 Surface Mine; 1988-05-01 to 1990-03-26; source msha-controller-operator-history
- **controller_controls_mine:** Kirk Meredith E → No 1 Surface Mine; 1988-05-01 to 1990-03-26; source msha-controller-operator-history
- **controller_controls_operator:** Kirk Meredith E → Kmf Corp; 1988-05-01 to 1990-03-26; source msha-controller-operator-history
- **operator_operates_mine:** Smithers Coal & Dock Inc → No 1 Surface Mine; 1990-03-27 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lancianese John → No 1 Surface Mine; 1990-03-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lancianese John → Smithers Coal & Dock Inc; 1990-03-27 to current/open; source msha-controller-operator-history