# Relationship history for MSHA mine 3606892

Current hierarchy: **Ronald  Lickman → Harriman Coal Corporation → Markson Silt**

- 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:** Goos Karl F → Markson Silt; 1979-06-18 to 1991-06-12; source msha-controller-operator-history
- **operator_operates_mine:** K & T Coal Company → Markson Silt; 1979-10-01 to 1981-10-25; source msha-controller-operator-history
- **controller_controls_mine:** Keim Ralph A & George W Tallman → Markson Silt; 1979-10-01 to 1983-06-06; source msha-controller-operator-history
- **controller_controls_operator:** Keim Ralph A & George W Tallman → K & T Coal Company; 1979-10-01 to 1981-10-25; source msha-controller-operator-history
- **operator_operates_mine:** G M P Land Company Inc → Markson Silt; 1981-10-26 to 1991-06-12; source msha-controller-operator-history
- **controller_controls_operator:** Goos Karl F → G M P Land Company Inc; 1981-10-26 to 1991-06-12; source msha-controller-operator-history
- **controller_controls_mine:** Ronald  Lickman → Markson Silt; 1984-07-16 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Harriman Coal Corporation → Markson Silt; 1991-06-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ronald  Lickman → Harriman Coal Corporation; 1991-06-13 to current/open; source msha-controller-operator-history