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Dating chart

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In 2013, the most recent year with complete data, there were 30,000.: A company called Enigma undertook this massive project to map out which neighborhood blocks in the U. are least likely to have proper safeguards in case of a fire.

The world-famous guarantee that It works or we fix it free™ still covers every Zippo windproof pocket lighter today.Darker shades of purple and green represent days We saw the corresponding person in real life. I call myself a statistician, because, well, I’m a statistics graduate student.However, the most important things I’ve learned are less formal, but have proven extremely useful when working/playing with data.Valuable information on the bottom of every Zippo windproof lighter can help you determine its date of manufacture.Starting in the mid 50’s, date codes were stamped on the bottom. The date codes have since become an invaluable tool for Zippo collectors.There have been three major changes, as show in inset.

From 1933 to the mid 50s, the word Zippo was stamped in block letters. What began as a quality-control tool for Zippo founder George G. To identify a potential pattern in any run of lighters returned for repair, the bottom of every Zippo lighter was encoded with a series of markings.

Most lighters fabricated between 19 can be identified by style and model and the patent or patent-pending marks.

The appearance of the word "Zippo" in the bottom stamp provides another clue to dating.

Using a detailed model (which they claim has 62 percent accuracy), the initial findings suggest that race, the age of a house, poverty and education level affect the likelihood that a household will have a working smoke alarm.

[Enigma, h/t Nathan Yau] How to make 2 percent look huge: A chart used by Rep.

If your Zippo lighter needs repair, send via a trackable method to Zippo Repair Clinic, 1932 Zippo Drive, Bradford, PA 16701.