论文部分内容阅读
Hewlett-Packard公司德康分部该公司的德康分部是美国较早从事商业性电话保密机的厂商之一。1959年就开始出售简式电话保密机。到1970年为止,在历年的电子购卖者手册中,都有它的销售广告。1972年前后,公司本部着手研究计算机数据存贮用的数据保密机。先后发表了有关的文献与专利。德康分部的产品主要有:105E型便携式语言倒频保密机;214型和215型无线电话保密机。 105E型保密机有如下几项特点:1.体积小,能放在一般的公文包或手提包中。2.重量轻,总共不足0.76公斤。3.电路简单,仅用了十多只晶体管。4.机内自备3伏电源,可连续工作100
Dekon Division, Hewlett-Packard Company The Dekang Division of the company is one of the earliest companies in the United States to operate commercial telephone security machines. 1959 began selling simple telephone security machine. As of 1970, there have been sales advertisements in the eTrader handbook over the years. Around 1972, the company started to study the computer data storage data security machine. Has published the relevant documents and patents. Dekang Division’s products mainly include: 105E-type portable language scramble machine; 214 and 215-type wireless telephone security machine. 105E-type security machine has the following characteristics: 1. Small size, can be placed in the general briefcase or handbag. 2. Light weight, a total of less than 0.76 kg. 3. The circuit is simple, only used more than a dozen transistors. 4 machine-owned 3-volt power supply, continuous work 100