During the year 1930 there was one engine which as on hype named as 'Ricardo' sleeve valve engine. Mirrlees the period introduced two Mirrleesengines represented this patent type of the valve engine. Well the first kind had bore of around 5.5 inches and developed a stroke of just about 6.5 inches and produced 20BHP each cylinder at rate of 900 r.p.m. the other had 17 inches bore and 21.5 inches stroke, giving 50BHP per cylinder on the rate of 200 r.p.m. A digital PHR also ensures the production of the health information in the legible form and facilitates the flow of the information between and doctor(s) whether only one physician is treating you or several doctors are participating in your care. Information in the record may be conveyed for a health-care provider(s) verbally, on the internet out form, digitally with an external medium like a usb flash drive, and in many cases via the Internet just before office visits. This simplicity of transfer of medical data is vitally important considering that 18% of medical errors are due to inadequate availability of patient information. Moreover, medical records are frequently lost, doctors retire, hospitals or HMOs purges old records to avoid wasting safe-keeping, and employers frequently change group health care insurance plans leading to patients being forced to change doctors and request for transfer medical records that are sometimes illegible. Despite efforts by government entities to encourage doctors to help keep medical records on the computer, i.e. utilize electronic medical records (EMRs) also called electronic health records (EHRs) in order to reduce errors, the very fact in the matter is just 5% of doctors keep medical records on the pc and a lot of which may have purchased EMRs haven't ever effectively implemented them or continued to use them of their practices.