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Page through William Steinway's diary using the buttons below. Click to view annotations (highlighted in red). Jump to a specific date or search for keywords using the tools to the right. Use the ...

This handheld electronic calculator has a black plastic case. In addition to ten digit keys, it has a decimal point key and a percentage key, an on/off switch, and yellow clear and clear indicator ...

This is an example of the first commercially sold handheld graphing electronic calculator, introduced by Casio in 1985. The sides of the calculator are black plastic, with a metal keyboard and back.

This small paperback book describes the operation of the Casio fx-7000GA graphing calculator. The undated publication is well illustrated. The calculator shown closely resembles the Casio fx-7000G, an ...

This is an example of a slightly later version of the Casio fx-7000G graphing calculator introduced by Casio in 1985. The sides of the calculator are black plastic, with a metal keyboard and back. As ...

This is an example of the first model of a scientific calculator marketed by Texas Instruments. The handheld electronic calculator has a black- and ivory-colored plastic case with an array of ...

This handheld electronic calculator has a tan plastic case and twenty-five square plastic keys. In addition to ten digit keys, a decimal point key, and a total key, it has a clear/clear entry key, a ...

The American Safety Lamp & Mine Supply Company hired M.D. Cremer of England to produce this lamp around 1913. M.D. Cremer, a former director of the Wolf Safety Lamp Company in England started the ...

This John Davis & Son safety lamp manufactured in the early 20th century is notable for its prominent padlock latch. Many mining safety lamps were fueled, locked, and distributed at the entrance of ...