SUMMA FOUR INC — DEF 14A

SUMMA FOUR INC of MANCHESTER, NH filed a DEF 14A with the SEC on 1998-06-26. Industry: Telephone & Telegraph Apparatus.

Filing

Filing timeline for this registrant (4)

FiledForm
1998-10-05DEFM14A
1998-06-26DEF 14A
1997-06-25DEF 14A
1996-06-19DEF 14A

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