# Relationship history for MSHA mine 1506783

Current hierarchy: **Harold E  Akers; Jim D  Akers → Sky View Mining Inc → No 2 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:** Jones & Kiser Coal Co → No 2 Mine; 1973-01-01 to 1975-01-06; source msha-controller-operator-history
- **controller_controls_mine:** Kiser Kaminski → No 2 Mine; 1973-01-01 to 1975-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Kiser Kaminski → Jones & Kiser Coal Co; 1973-01-01 to 1975-01-06; source msha-controller-operator-history
- **controller_controls_mine:** Jim D  Akers et al → No 2 Mine; 1974-09-11 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Sky View Mining Inc → No 2 Mine; 1975-01-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jim D  Akers et al → Sky View Mining Inc; 1975-01-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Harold E  Akers et al → Sky View Mining Inc; 1975-01-07 to current/open; source msha-controller-operator-history