| 摘要 |
742,192. Testing timepiece balances. BULOVA WATCH CO., Inc., NEW YORK, SUCCURSALE DE BIENNE. March 17, 1953 [April 9, 1952], No. 7389/53. Drawings to Specification. Class 139 In an apparatus for timing and adjusting the frequency of vibration of a balance, balance staff and hair spring assembly as described in Specifications 742,190 means are provided for deriving an electrical voltage which is dependent on the momentary position of the balance. The subject-matter of this Specification is substantially the same as that described in Specification 742,190, but the claims differ. Specification 742,191 also is referred to. |
