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We have a serial number chart available by clicking this link to determine age of your VIBROPLEX key. Please note that no model information corresponds to serial numbers - the serial number only indicates date of manufacture. AUTOPLEX (electromagnetic predecessor) 1902-1905. K9WDY collection. DOUBLE LEVER - independent dit and dah key levers. Restored by W4PAL.

GST does not attempt to predict the future, it cannot. As well as providing a strategic context, this 5th edition of Global Strategic Trends ( GST 5) identifies long term threats and opportunities, out to 2045. Rather, it describes those phenomena that could have a significant impact on the future and combines these differing perspectives to produce a multifaceted picture of possible outcomes. The global future 5th edition pdf. Without a strategic context there is a risk that planners, policymakers and capability developers may assume a future that adheres to preconceived thoughts and assumptions. Global Strategic Trends ( GST) describes a strategic context for those in the Ministry of Defence (MOD) and wider Government who are involved in developing long term plans, policies and capabilities.

• Vibroplex Bug Serial Numbers

When Was Your Vibroplex Made?

Until recently, the Vibroplex Co. put serial numbers on almost all of its keys, except a few early production runs. However, records of production dates and serial numbers were lost, discarded, or destroyed. There was no way to match a key’s serial number to a date until 1996, when John Elwood, WW7P, published a list of serial number ranges and corresponding production dates. Starting in 1990, John compiled his list from a survey of more than 3000 Vibroplexes, their serial numbers, and the date they were purchased, if known.

Owners should apply some common sense to the information in John’s document. As John says, much of the serial number/date table was generated by interpolation. I believe the dates are accurate to within a year or so. For few years after WW1, Vibroplex advertised the number they had sold, so the dates are very accurate. John has added commas to the serial numbers to make the table easier to read. Vibroplex did not use commas inside serial numbers.

When the Vibroplex Co. changed hands and was moved to Portland, ME in 1979, the serial number sequence was restarted and became fairly erratic. The company again changed hands and was moved to Mobile, AL in 1995. At that point the serial number sequence was restarted at 100,000. If your Vibroplex has a Portland, ME nameplate, John’s table will help you find when it was made, but John’s table doesn’t include information for Alabama bugs. The company was sold and moved to Knoxville, TN in 2005. Vibroplex products made there unfortunately have no serial number.

Many thanks to John for a truly amazing effort!

Vibroplex Serial Numbers per Year

John Elwood, WW7P, did a heroic job of determing the age of Vibroplex keys by serial number. One place to find his document is on the Vibroplex site here.

Download aplikasi radio offline. Using WW7P's data, I built a spreadsheet and calculated how many serial numbers were used in each year from 1905 to 1999 and then I graphed it.

I'm not entirely sure that this means anything, but the peaks for the World Wars and the trough for the Great Depression are pretty obvious.

Vibroplex Bug Serial Numbers

The image is linked to a full-size version of the graph.