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Printer tracking dots, also known as printer steganography, DocuColor tracking dots, yellow dots, secret dots, or a machine identification code (MIC), is a digital watermark which many color laser printers and photocopiers produce on every printed page that identifies the specific device that was used to print the document.
Starting in April 1950 new serial numbers are brought into use. These new serials are formatted YYMSQD where YY is the year of manufacture, M is the type of machine, S is the specific model of machine, Q is the quarter of the year of manufacture, and D notes deviation from the standard model.
Serial numbers are often used in network protocols. However, most sequence numbers in computer protocols are limited to a fixed number of bits, and will wrap around after sufficiently many numbers have been allocated. Thus, recently allocated serial numbers may duplicate very old serial numbers, but not other recently allocated serial numbers.
The button is located on the improved shuttle frame, Singer part number 54507, which can be retrofitted onto older model 27 and 28 machines. The bobbin winder is mounted high on the pedestal, where a small rubber tire occupying its pulley makes contact with the motor belt.
The following April 17, Singer was given an educational order of 500 units with serial numbers S800001 – S800500. The educational order was a programme set up by the Ordnance Board in the U.S. to teach companies without gun-making experience to manufacture weapons. Singer delivered 500 units to the U.S. government.
The printing press is most famous for its windmill-like automatic paper feed mechanism. There are two blades that rotate from the paper feed, where it picks up a sheet of paper; to the platen, where the printing impression is made; to the delivery rack, where the paper is released; followed by the blade pointing straight up ready to start the next cycle.
The AMT Backup is a small semi-automatic pistol. It was first manufactured by the Ordnance Manufacturing Corporation (OMC) of El Monte, CA. The first guns made in .380 ACP by OMC are known as the OMC Backup.
The distinctive case of the machine, with the blank roll carrier below A conductor's view, showing the setting dials Typical Setright UK bus ticket from 1960 showing left to right: fare paid as 1 shilling and 3 pence, stage boarded as 26, date issued as JUL 28, ticket serial 390, machine number BT976, class of ticket as SINGLE journey