- Bakelite knife switches with easy-to-use spring building posts
- Elementary to high school level and laboratory experiments
- Come with posts
|3147-87||Single||Single||4″ x 2″ x 1″|
|3147-88||Single||Double||4″ x 2″ x 1″|
|3147-89||Double||Single||4″ x 3″ x 1″|
|3147-90||Double||Double||4″ x 3″ x 1″|
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