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Retirement Benefit Plans (Tables)
3 Months Ended
Sep. 30, 2019
Retirement Benefit Plans  
Schedule of net periodic pension expense

Three Months Ended September 30, 

    

2018

2019

Service cost

$

98

$

100

Interest cost

8

8

Amortization of prior service cost

 

14

 

13

Net periodic pension expense

$

120

$

121