Dating old tools
Biostratigraphy: One of the first and most basic scientific dating methods is also one of the easiest to understand.
Layers of rock build one atop another — find a fossil or artifact in one layer, and you can reasonably assume it’s older than anything above it.
Photographs of roughly half of the tools that are still in the collection are included here.
Information and notes on some of the tools are also included.
The brand name of your refrigerator should be on the front door.
To discover the year, you must choose a brand from the pop-up list and enter the model and serial numbers of your refrigerator.Items without a mark were either domestic American production, non-prestige imported production, or imported production that wasn't specifically produced for the American market.Lack of mark does NOT equate to lack of value or quality.If you see a mark that simply says a country name it was made after 1890 for export to the United States.Once the requirement for foreign origins was imposed, many American manufacturers also began marking their items with some indication of source to take advantage of "Buy American" sentiment.