# Relationship history for MSHA mine 0503221

Current hierarchy: **Wiley Raymond → American Fuels Inc → Pryor 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:** Viking Coal Company → Pryor Mine; 1978-10-01 to 1980-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Churches Kenneth → Pryor Mine; 1978-10-01 to 1980-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Churches Kenneth → Viking Coal Company; 1978-10-01 to 1980-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Thyssen Mining Construction Inc → Pryor Mine; 1980-04-01 to 1983-08-07; source msha-controller-operator-history
- **controller_controls_mine:** Thyssen Schachtbau Gmbh → Pryor Mine; 1980-04-01 to 1983-08-07; source msha-controller-operator-history
- **controller_controls_operator:** Thyssen Schachtbau Gmbh → Thyssen Mining Construction Inc; 1980-04-01 to 1983-08-07; source msha-controller-operator-history
- **operator_operates_mine:** American Fuels Inc → Pryor Mine; 1983-08-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Wiley Raymond → Pryor Mine; 1983-08-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wiley Raymond → American Fuels Inc; 1983-08-08 to current/open; source msha-controller-operator-history