# Relationship history for MSHA mine 2601496

Current hierarchy: **Janess William K → Argus Mining Company → Fisk-Robertson 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:** Fisk-Robertson Mining → Fisk-Robertson Mine; 1978-03-09 to 1984-12-11; source msha-controller-operator-history
- **controller_controls_mine:** Fisk George & Richard-Wilbur Robertson → Fisk-Robertson Mine; 1978-03-09 to 1984-12-11; source msha-controller-operator-history
- **controller_controls_operator:** Fisk George & Richard-Wilbur Robertson → Fisk-Robertson Mining; 1978-03-09 to 1984-12-11; source msha-controller-operator-history
- **operator_operates_mine:** Montezuma Mining Inc → Fisk-Robertson Mine; 1984-12-12 to 1985-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Wilson Albert → Fisk-Robertson Mine; 1984-12-12 to 1985-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Wilson Albert → Montezuma Mining Inc; 1984-12-12 to 1985-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Millcreek Mining Inc → Fisk-Robertson Mine; 1985-07-01 to 1986-04-30; source msha-controller-operator-history
- **controller_controls_mine:** Elmer  Richter → Fisk-Robertson Mine; 1985-07-01 to 1986-04-30; source msha-controller-operator-history
- **controller_controls_operator:** Elmer  Richter → Millcreek Mining Inc; 1985-07-01 to 1986-04-30; source msha-controller-operator-history
- **controller_controls_mine:** Janess William K → Fisk-Robertson Mine; 1986-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Argus Mining Company → Fisk-Robertson Mine; 1986-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Janess William K → Argus Mining Company; 1986-05-01 to current/open; source msha-controller-operator-history