These copies or duplicates are the talking-machine records which the public ultimately purchases. 佚名.神奇的知识之书.
While duplicates of the two letters were being made, the Union generals present were severally presented to General Lee. 尤利西斯·格兰特.U．S．格兰特的个人回忆录.
Consequently, it is necessary to provide some way by which duplicates may be made cheaply enough to permit their purchase by the public at a reasonable price. 弗兰克·刘易斯·戴尔.爱迪生的生平和发明.
May I ask whether the two busts smashed in Dr. Barnicot's rooms were the exact duplicates of the one which was destroyed in Morse Hudson's shop? 阿瑟·柯南·道尔.福尔摩斯归来记.
There are a number of duplicates of each character, and the moulds containing the same character are all arranged in one tube. 威廉·亨利·杜利特.世纪发明.
Here are his keys, which are the duplicates of Mr. Rucastle's. 阿瑟·柯南·道尔.福尔摩斯历险记.
For making duplicates it was obviously necessary to first secure a mold carrying the record in negative or reversed form. 弗兰克·刘易斯·戴尔.爱迪生的生平和发明.
Duplicates were also made for each soldier and signed by each individually, one to be retained by the soldier signing and one to be retained by us. 尤利西斯·格兰特.U．S．格兰特的个人回忆录.
When the shell is secured the next step is to provide a matrix which serves as a die or stamp from which to press copies or duplicates of the master record. 佚名.神奇的知识之书.
The etched disc is then electrotyped to form a matrix, and from this electrotype hard rubber duplicates of the original record are molded, which are capable of giving 1,000 reproductions. Edward W. Byrn.十九世纪发明进展.