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Bob's Calculators and Slide Rules
a. My Collection
Electronic Calculators
APF
Aristo
Aurora
Bowmar
Calculated Industries
Canon
Casio
Citizen
Commodore
Compucorp
Craig
Hewlett Packard
Kosmo
Litronix
Miscellaneous
Novus & NSC
Omron
Panasonic
Radio Shack
RCA
Realtone
Rockwell
Sharp
Tamaya
Texas Instruments
Tozai
Unisonic
Ventron
Measuring Rules
Mechanical Calculators
Abaci
Adix
Arithma
Comptometer
Curta
Dial-A-Matic
Gem
Lightning Adder
Marchant
Monroe
Sears
Speedee Add-A-Matic
Star Adding Machine
Tasco
Printed References
Slide Rules
2 Foot Gunter Rule
Allegheny Plastics
Alro
Aristo
Arlton
Bifold Gunter Rules
Blundell
Boots
Boucher's (Stanley)
C&E Charles Ettier
CalMath
Chadwick
Charpentier
Concise
Controller
Corona Lighter
Cox & Stevens
Cubemaster
Dempster
Dietzgen
Diwa
Faber-Castell
Fowler
French Photography Advertising Rules
Fuller
Gilson
Graphoplex
Halden
Hughes-Owens
Jeppesen
Kane Aero
Keuffel & Esser
Kontrolpribor
Lord's
Mascot
Molter
NIC
Norma
Otis King
Paper
Parisian Novelty
Perrygraf
Pickett
Post
Reproduction Size Calculator
Roplex
Scientific Instruments Co. (SIC)
STAR
Stevens Rally Indicator
Sun Hemmi
Supremathic
Trig Easy
Unidentified
Unique
UTO
W&G
Lawrence
b. My Replicas
3 Thacher Replicas
Building a Thacher v3
Fuller Replica
Loga
Thacher Rescale
c. Battery Pack Mods
HP Classic AA Battery Pack Adapters
HP Sting Battery Pack
HP Woodstock AA Battery Pack Mod
Is It Safe?
TI Classic AA Battery Pack Mod
TI SR-51-II Battery Pack Mod (BP6)
Bob's Calculators and Slide Rules
Reproduction Size Calculator
Here are a couple plastic rules used to calculate enlargements and reductions.
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